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2.5.1. Web Proxy Administrative Web Page
A web proxy server is really a program that produces requests for websites on behalf of other machines in your intranet. The proxy server will cache the web pages it retrieves on the web so that if 3 machines request precisely the same page just one transfer through the Internet is necessary. If your organization carries a number of frequently used web sites this may save on Internet accesses.
Normally you need to configure the internet browsers used in your network to utilize the proxy server for Internet access. You should set the name/address in the proxy to that from the IPCop machine along with the port towards the one you could have entered into the Proxy Port box, default 8080. This configuration allows browsers to bypass the proxy as long as they wish. It is also possible running the proxy in transparent mode. In this case the browsers need no special configuration plus the firewall automatically redirects all traffic on port 80, the normal HTTP port, for the proxy server.
The first line inside Settings box indicates if your proxy server is stopped or running.
Figure 2.23. Web proxy - Common settings, Upstream proxy Log Settings Sections
You can pick if you wish to proxy requests from the Green private network and/or your Blue wireless network if fitted. Just tick established track record boxes.
Enabled Tick the suitable checkbox make it possible for the proxy server to pay attention for requests about the selected interface Green or Blue. If the proxy service is disabled, all client requests is going to be forwarded directly on the destination address.
Transparent If transparent mode is enabled, all requests for your destination port 80 is going to be forwarded towards the proxy server with no need to specially configure your visitors.
Proxy Port. This will be the port what is the best the proxy server will listen for client requests. The default is 8080. In transparent mode, all client requests for port 80 will automatically be redirected to the port.
Visible hostname - optional. If you would like to display a new hostname in proxy server error messages to clients, or even for upstream proxy servers, then specify it here. If you let it sit blank, your IPCops real hostname will probably be used.
Cache administrator email - optional. You can specify a real world address that appears in proxy server error messages to clients. If you get forced out blank, webmaster is going to be used instead.
Error messages language. You can pick the language during which any proxy server error messages will likely be shown to clients.
Error messages design. You can choose the design style by which proxy server error messages are consideration to clients. You can chose between IPCop and Standard.
The IPCop design features a nice graphic banner, even though the Standard design will be the usual one shipped with Squid.
Figure 2.24. Proxy Error Message Designs. IPCop within the left, Standard around the right.
If you define a Visible hostname see above, the Standard design can be used.
Suppress version information. Tick this checkbox in order to avoid the display with the version of Squid Cache in Squids error messages to clients.
Squid Cache version. This indicates the version of Squid Cache installed.
These settings are usually necesary for chained proxy environments.
If your ISP requires you to work with their cache for web access you then should specify the hostname and port within the Upstream proxy text box. If your ISPs proxy has a username and password then enter them inside the Upstream username and Upstream password boxes.
Proxy address forwarding. This enables the HTTP VIA header field. If enabled, this information are going to be added on the HTTP header:
If the final proxy in chain doesnt strip search engine optimization gainesville, it is going to be forwarded for the destination host!
This field are going to be suppressed automagically.
Client IP address forwarding. This enables the HTTP X-FORWARDED-FOR header field. If enabled, the inner client IP address are going to be added towards the HTTP header, :
This can a good choice for source based ACLs or logging on remote proxy servers.
If the past proxy in chain doesnt strip search engine optimization gainesville, it will probably be forwarded on the destination host!
Instead of forwarding unknown, this field will likely be completely suppressed automagically.
Username forwarding. If any sort of authentication is activated, this lets the forwarding from the login name.
This can a good choice for user based ACLs or logging on remote proxy servers.
This is designed for ACL or logging purposes only, and doesnt work when the upstream proxy takes a real login.
This forwarding is limited towards the username. The password aren't going to be forwarded.
No connection oriented authentication forwarding. This disables the forwarding of Microsoft connection oriented authentication NTLM and Kerberos.
Log enabled. If you choose to permit the proxy, then you definately can also log web accesses by ticking the Log Enabled checkbox. This enables the proxy server system log too, which might be great for troubleshooting.
Accesses made from the proxy is so visible by visiting the Proxy Logs webpage.
Log query terms. The part from the URL containing dynamic queries is going to be stripped automatically before logging. Enabling the alternative Log query terms will turn this off plus the complete URL is going to be logged.
Log useragents. Enabling Log useragents writes the useragent string on the log file
This log file option should just be enabled for debugging purposes and also the results are not shown with all the GUI based log viewer.
You can select how much disk space must be used for caching website pages in the Cache Management section. You can also set the size with the smallest mind be cached, normally 0, and also the largest, 4096KB.
For privacy reasons, the proxy will not likely cache pages received via https, or some other pages where a account are submitted using the URL.
Caching may take up a great deal of space on your own hard drive. If you use a substantial cache, next the minimum size hard disk drive listed from the IPCop documentation will never be large enough.
The larger the cache you end up picking, a lot more memory becomes necessary by the proxy server to regulate the cache. If that you are running IPCop using a machine with low memory don't choose a substantial cache.
Memory cache size. This will be the amount of physical RAM to be used in negative-cached and in-transit objects. This value should never exceed over 50% within your installed RAM. The minimum because of this value is 1 MB, the default is 2 MB.
This parameter isn't going to specify the utmost process size. It only places a set limit on simply how much additional RAM the proxy make use of as a cache of objects.
Harddisk cache size. This would be the amount of disk space, in MB, to make use of for cached objects. The default is 50 MB. Change this to fit your configuration. Do not put the dimensions of your disk drive here. Instead, if you would like squid to utilize the entire disk drive, subtract 20% and rehearse that value.
Set the Memory cache size along with the Harddisk cache size both to 0, to fully disable caching.
Min object size. Objects smaller compared to this size will never be saved on disk. The value is laid out in kilobytes, along with the default is 0 KB, this means there is no minimum.
Max object size. Objects bigger than this size will never be saved on disk. The value is specified by kilobytes, along with the default is 4 MB. If you wish to increase speed, over you need to save bandwidth, you must leave this low.
Number of level-1 subdirectories. The default value for that harddisk cache level-1 subdirectories is 16.
Each level-1 directory contains 256 subdirectories, so something of 256 level-1 directories make use of a total of 65536 directories to the harddisk cache. This will significantly reduce the startup process on the proxy service but they can speed up the caching under certain conditions.
The recommended value for level-1 directories is 16. You should increase this value as long as its necessary.
Memory replacement policy. The memory replacement policy parameter determines which objects are purged from memory, when random access memory is needed. The default policy for memory replacement on IPCop is LRU.
Squids original list based Last Recently Used policy. The LRU policy keeps recently referenced objects. For instance, it replaces the item that has not been accessed for that longest time.
The heap Greedy-Dual Size Frequency policy optimizes object hit rate keeping smaller popular objects in cache, so it carries a better prospects for getting a hit. It achieves less byte hit rate than LFUDA though, because it evicts larger possibly popular objects.
Least Frequently Used with Dynamic Aging. This policy keeps popular objects in cache in spite of their size thereby optimizes byte hit rate with the expense of hit rate since one large, popular object may prevent many smaller, slightly less popular objects from being cached.
Last Recently Used policy implemented utilizing a heap. Works like LRU, but utilizes a heap instead.
If while using the LFUDA replacement policy, the price of Max object size really should be increased above its default of 4096 KB to maximise the potential byte hit rate improvement of LFUDA.
Cache replacement policy. The cache replacement policy parameter decides which objects will continue to be in cache and which objects are evicted replaced to generate space with the new objects. The default policy for cache replacement on IPCop is LRU.
Enable offline mode. Enabling this approach will let down the validation of cached objects. This gives having access to more cached information stale cached versions, the place that the original server must have been contacted.
Do not cache these destinations optional. A list of sites which increase the risk for request not to ever be satisfied in the cache along with the reply not to ever be cached. In other words, utilize this to force objects not to ever be cached.
You can enter every one of these destination types in almost any order.
These fields enumerate the allowed destination ports for standard HTTP and SSL encrypted HTTPS requests.
The ports is usually defined like a single port number or even a range of ports.
This defines the access control for accessing the proxy server based within the client network address.
Allowed subnets. All listed subnets may access the proxy server. By default, the subnets for GREEN and BLUE if on offer are listed here.
You may add other subnets, like subnets behind GREEN in larger environments, to this particular list. All subnets unpublished here are going to be blocked for web access.
Disable internal proxy access. This option prevents direct HTTP access through the interior proxy want to local web servers at those subnets, as defined above. This selection overrides this two options which manage HTTP entry to GREEN and from BLUE.
Disable internal proxy entry to Green business subnets. This prevents direct HTTP access through the inner proxy intend to web servers on GREEN from some other subnet BLUE.
For example, while proxy access is enabled for GREEN and BLUE, usually all requests are going to be forwarded to RED. But when suer from BLUE would like to access an online server on GREEN, the Proxy Server takes the inner shortcut involving the BLUE and also the GREEN interface, in spite of any firewall rules.
To protect your servers on GREEN, its recommended that you enable this option and utilize the Address Filter or DMZ pinholes if required.
Disable internal proxy access from Blue for some other subnets. This prevents direct HTTP access through the interior proxy service from BLUE to web servers on some other subnet.
For example, while proxy access is enabled for GREEN and BLUE, usually all requests will probably be forwarded to RED. But when suer from BLUE wishes to access a web site server on GREEN, the Proxy Server takes the inner shortcut involving the BLUE plus the GREEN interface, irrespective of any firewall rules.
This choices only available having a BLUE interface installed.
If enabled, clients on BLUE could only access web servers on BLUE or RED.
Unrestricted IP addresses optional. All client IP addresses in this particular list will override these restrictions:
Authentication are going to be required automagically for these addresses, but could be powered down
Unrestricted MAC addresses optional. All client MAC addresses in this particular list will override this restrictions:
Authentication will likely be required automatically for these addresses, but could be deterred
Using MAC addresses as opposed to IP addresses is usually useful if your DHCP service is enabled with no fixed leases defined.
The proxy server is only able to determine MAC addresses from clients configured for your subnets in the GREEN, BLUE or ORANGE interfaces.
Banned IP addresses optional. All requests through the clients IP addresses or subnets listed here is going to be blocked.
Banned MAC addresses optional. All requests from clients with this list is going to be blocked.
The ClassRoom Extensions CRE towards the proxy server provide you with the ability to delegate administrative tasks to non-administrative users by using a separate Web Access Management page.
This section defines when the online world proxy is active. The default position would be to allow access round the clock, few days a week.
The Access option allow permits web access, plus the deny option blocks web access inside selected timeframe. The choice of allow or deny will depend within the time rules you intend to apply.
This section lets you enter limits to the size of each one download and/or upload request. The values get in Kilobytes KB. You can use this to stop your Users downloading large files and slowing Internet access for all else.
Set the Max download size and Max upload size fields to 0, the default, to get rid of all restrictions.
The download bandwith is usually unlimited, or limited per interface, and/or per host, or based for the type of content.
Bandwidth limits could be defined per interface as a possible overall limit, and per host. The used bandwith for many hosts will likely be limited because of the overall limit.
By default, throttling affects a myriad of traffic, but throttling could be limited to some kinds of content. However, this disables throttling for other kinds of content.
Figure 2.25. Web proxy - Time restrictions, Transfer limits Download throttling Sections
The MIME type filter is usually configured to close content according to its MIME type.
Enabled. If enabled, the filter checks all incoming headers for MIME type.
Block these MIME types optional. If the requested MIME type is listed to become blocked, having access to it will likely be denied. This way you are able to block content, no matter what form of file name extension is needed.
For example, add this MIME type using one line if you would like block the download of Word files:
Or, add these MIME types, each type with a separate line, if you need to block the download of MPEG and QuickTime videos:
Do not filter these destinations optional. Use this list in order to avoid MIME type filtering particular destinations. This must be a list, each one on the separate line, of Domains or Subdomains, Hostnames, IP Addresses, or URLs.
Enable browser check. Check this box if you need to enable browser checking.
Allowed clients for web access. Check the suitable boxes for permitted clients.
Figure 2.26. Web proxy - MIME type filter Web browser Sections
This allows the alteration of some HTTP header fields to safeguard your privacy.
Fake useragent listed in external sites optional. By default, the useragent with the currently used web browser is going to be submitted to external web servers. Some dynamic websites generate the content depending around the submitted useragent string. This string also are logged to your Web Server log files.
With the Fake useragent option you've got the capability to rewrite this string for all your visitors. For outgoing requests the useragent header field will probably be changed through the proxy server and published to external sites instead with the original useragent string. This can be handy to protect your privacy as well as to enforce a desired degree of compatibility.
Fake referer listed in external sites optional. When clicking a keyword rich link, the original source URL is going to be submitted to your destination website. This may be turned off by entering an individual defined string. This string will likely be submitted instead in the real referring URL. This they can be handy to protect your privacy.
Modifying the referer violates the HTTP standard and might sometimes cause difficulties. Some websites are blocking requests by having an invalid referer to safeguard themselves against so named deep links or abuse by stealing graphics using their company website.
Redirectors work together with the proxy to filter and redirect website traffic based on rules which could include blacklists, whitelists, time limitations etc.
Enabled. Check the box make it possible for redirectors.
Number of redirector processes. You can increase or decrease the quantity of active filter processes. The amount of processes depends with your hardware performance, your bandwidth as well as the concurrent volume of clients. The default value is 5.
Available redirectors. Lists the redirectors installed, and that is active. URL Filter, in this particular example.
The Web Proxy offers several strategies to user authentication.
None default. Authentication is disabled. Users don't need to authenticate when accessing sites.
Local. This authentication method could be the preferred solution for SOHO environments. Users should authenticate when accessing websites by entering a valid password. See the Local Proxy Authentication section for more information.
identd. This authentication method would be the preferred solution for environments where
The identd authentication method requires an identd service or daemon running about the client. See the identd Authentication section additional information.
LDAP. This authentication method may be the preferred solution for medium and big network environments. Users should authenticate when accessing internet sites by entering a valid account information. The credentials are verified against an outside Server utilizing the Lightweight Directory Access Protocol LDAP.
LDAP authentication are going to be useful if you could have already a directory service within your network and will not want to maintain additional user accounts and passwords for web access. See the LDAP Authentication section for even more information.
Windows. This authentication method may be the preferred solution for smaller than average medium network environments. Users have to authenticate when accessing internet sites. The credentials are verified against a Server acting like a Domain Controller. See the Windows Authentication section for additional information.
RADIUS. This authentication method could be the preferred solution for smaller than average medium network environments. Users will need to authenticate when accessing internet websites. The credentials are verified against an outside RADIUS server. See the RADIUS Authentication section for even more information.
When using authentication and enabling the net proxy log files, the requesting user name will likely be logged in addition on the requested URL. Before enabling log files with all the authentication, ensure not to violate existing laws.
Clear cache. You can flush all pages out in the proxy cache anytime by clicking the Clear cache button.
Save. After coming to a changes, press the Save button to utilize them.
2.5.2. URL Filter Administrative Web Page
2.5.1. Web Proxy Administrative Web Page
A web proxy server is usually a program that creates requests for websites on behalf of the rest of the machines on your own intranet. The proxy server will cache all pages and posts it retrieves online so that if 3 machines request exactly the same page just one transfer from your Internet is essential. If your organization features a number of widely used web sites this tends to save on Internet accesses.
Normally you should configure the world wide web browsers used on your own network make use of the proxy server for Internet access. You should set the name/address in the proxy to that in the IPCop machine as well as the port to your one you might have entered into the Proxy Port box, default 8080. This configuration allows browsers to bypass the proxy whenever they wish. It is also possible to own the proxy in transparent mode. In this case the browsers need no special configuration and also the firewall automatically redirects all traffic on port 80, the typical HTTP port, for the proxy server.
The first line inside the Settings box indicates in the event the proxy server is stopped or running.
Figure 2.23. Web proxy - Common settings, Upstream proxy Log Settings Sections
You can make if you wish to proxy requests from the Green private network and/or your Blue wireless network if fitted. Just tick established track record boxes.
Enabled Tick the suitable checkbox to allow the proxy server to concentrate for requests for the selected interface Green or Blue. If the proxy service is disabled, all client requests will likely be forwarded directly for the destination address.
Transparent If transparent mode is enabled, all requests for your destination port 80 will probably be forwarded to your proxy server without having to specially configure your customers.
Proxy Port. This may be the port what is the best the proxy server will listen for client requests. The default is 8080. In transparent mode, all client requests for port 80 will automatically be redirected to the present port.
Visible hostname - optional. If you need to display a new hostname in proxy server error messages to clients, or even for upstream proxy servers, then specify it here. If you get out blank, your IPCop s real hostname will likely be used.
Cache administrator email - optional. You can specify a particular email address that appears in proxy server error messages to clients. If you let it rest blank, webmaster is going to be used instead.
Error messages language. You can simply select the language during which any proxy server error messages will likely be shown to clients.
Error messages design. You can choose the design style through which proxy server error messages are demonstrated to clients. You can chose between IPCop and Standard.
The IPCop design has a nice graphic banner, as you move the Standard design will be the usual one shipped with Squid.
Figure 2.24. Proxy Error Message Designs. IPCop around the left, Standard around the right.
If you define a Visible hostname see above, the Standard design can be used.
Suppress version information. Tick this checkbox to avoid the display from the version of Squid Cache in Squids error messages to clients.
Squid Cache version. This indicates the version of Squid Cache installed.
These settings are usually necesary for chained proxy environments.
If your ISP requires you make use of their cache for web access then you definitely should specify the hostname and port within the Upstream proxy text box. If your ISPs proxy needs a username and password then enter them from the Upstream username and Upstream password boxes.
Proxy address forwarding. This enables the HTTP VIA header field. If enabled, this information are going to be added towards the HTTP header:
If the very last proxy in chain doesnt strip search engine optimization, it will probably be forwarded for the destination host!
This field is going to be suppressed automagically.
Client IP address forwarding. This enables the HTTP X-FORWARDED-FOR header field. If enabled, the inner client IP address is going to be added towards the HTTP header, :
This can ideal for source based ACLs or logging on remote proxy servers.
If the very last proxy in chain doesnt strip search engine optimization gainesville, it will likely be forwarded on the destination host!
Instead of forwarding unknown, this field is going to be completely suppressed automatically.
Username forwarding. If almost any authentication is activated, this allows the forwarding in the login name.
This can helpful for user based ACLs or logging on remote proxy servers.
This is perfect for ACL or logging purposes only, and doesnt work when the upstream proxy takes a real login.
This forwarding is limited towards the username. The password are not forwarded.
No connection oriented authentication forwarding. This disables the forwarding of Microsoft connection oriented authentication NTLM and Kerberos.
Log enabled. If you choose make it possible for the proxy, then you definately can also log web accesses by ticking the Log Enabled checkbox. This enables the proxy server system log too, which might be a good choice for troubleshooting.
Accesses made from the proxy is seen by visiting the Proxy Logs webpage.
Log query terms. The part from the URL containing dynamic queries is going to be stripped automagically before logging. Enabling the possibility Log query terms will turn this off and also the complete URL are going to be logged.
Log useragents. Enabling Log useragents writes the useragent string towards the log file
This log file option should basically enabled for debugging purposes as well as the results are not shown with all the GUI based log viewer.
You can select how much disk space really should be used for caching websites in the Cache Management section. You can also set the size on the smallest resist be cached, normally 0, along with the largest, 4096KB.
For privacy reasons, the proxy is not going to cache pages received via https, or some other pages where a details are submitted using the URL.
Caching may take up a great deal of space on the hard drive. If you use a sizable cache, then a minimum size hard disk drive listed inside the IPCop documentation aren't going to be large enough.
The larger the cache you select, greater memory is necessary by the proxy server to control the cache. If you happen to be running IPCop on the machine with low memory tend not to choose a substantial cache.
Memory cache size. This would be the amount of physical RAM to be employed for negative-cached and in-transit objects. This value should never exceed over 50% of one's installed RAM. The minimum because of this value is 1 MB, the default is 2 MB.
This parameter will not specify the ideal process size. It only places an established limit on just how much additional RAM the proxy use as a cache of objects.
Harddisk cache size. This may be the amount of disk space, in MB, to make use of for cached objects. The default is 50 MB. Change this to match your configuration. Do not put the dimensions of your disk drive here. Instead, if you'd like squid make use of the entire disk drive, subtract 20 % and utilize that value.
Set the Memory cache size and also the Harddisk cache size both to 0, to fully disable caching.
Min object size. Objects less space-consuming than this size are not saved on disk. The value is specified by kilobytes, plus the default is 0 KB, this means there is no minimum.
Max object size. Objects greater than this size are not saved on disk. The value is per kilobytes, plus the default is 4 MB. If you wish to increase speed, a lot more than you wish to save bandwidth, you ought to leave this low.
Number of level-1 subdirectories. The default value for your harddisk cache level-1 subdirectories is 16.
Each level-1 directory contains 256 subdirectories, so a price of 256 level-1 directories make use of a total of 65536 directories for your harddisk cache. This will significantly slow up the startup process from the proxy service but could speed up the caching under certain conditions.
The recommended value for level-1 directories is 16. You should increase this value not until its necessary.
Memory replacement policy. The memory replacement policy parameter determines which objects are purged from memory, when remembrance is needed. The default policy for memory replacement on IPCop is LRU.
Squids original list based Last Recently Used policy. The LRU policy keeps recently referenced objects. For instance, it replaces the article that has not been accessed for your longest time.
The heap Greedy-Dual Size Frequency policy optimizes object hit rate by maintaining smaller popular objects in cache, so it incorporates a better possibility of getting a hit. It achieves a reduced byte hit rate than LFUDA though, mainly because it evicts larger possibly popular objects.
Least Frequently Used with Dynamic Aging. This policy keeps popular objects in cache irrespective of their size and therefore optimizes byte hit rate with the expense of hit rate since one large, popular object can prevent many smaller, slightly less popular objects from being cached.
Last Recently Used policy implemented utilizing a heap. Works like LRU, but works on the heap instead.
If while using LFUDA replacement policy, the need for Max object size ought to be increased above its default of 4096 KB to improve the potential byte hit rate improvement of LFUDA.
Cache replacement policy. The cache replacement policy parameter decides which objects will stay in cache and which objects are evicted replaced to produce space to the new objects. The default policy for cache replacement on IPCop is LRU.
Enable offline mode. Enabling this program will switch off the validation of cached objects. This gives entry to more cached information stale cached versions, the spot that the original server must have been contacted.
Do not cache these destinations optional. A list of sites which increase the risk for request never to be satisfied through the cache plus the reply never to be cached. In other words, employ this to force objects to prevent be cached.
You can enter most of these destination types in every order.
These fields enumerate the allowed destination ports for standard HTTP and SSL encrypted HTTPS requests.
The ports might be defined like a single port number or maybe a range of ports.
This defines the access control for accessing the proxy server based around the client network address.
Allowed subnets. All listed subnets may access the proxy server. By default, the subnets for GREEN and BLUE if on offer are listed here.
You can also add other subnets, like subnets behind GREEN in larger environments, for this list. All subnets unpublished here will probably be blocked for web access.
Disable internal proxy access. This option prevents direct HTTP access through the interior proxy want to local web servers at those subnets, as defined above. This selection overrides the subsequent two options which manage HTTP having access to GREEN and from BLUE.
Disable internal proxy entry to Green off their subnets. This prevents direct HTTP access through the inner proxy need to web servers on GREEN from every other subnet BLUE.
For example, while proxy access is enabled for GREEN and BLUE, usually all requests is going to be forwarded to RED. But when a customer from BLUE would like to access a website server on GREEN, the Proxy Server takes the interior shortcut between BLUE as well as the GREEN interface, no matter any firewall rules.
To protect your servers on GREEN, its recommended that you enable this option and utilize the Address Filter or DMZ pinholes if needed.
Disable internal proxy access from Blue for some other subnets. This prevents direct HTTP access through the inner proxy service from BLUE to web servers on some other subnet.
For example, while proxy access is enabled for GREEN and BLUE, usually all requests will likely be forwarded to RED. But when suer from BLUE desires to access a website server on GREEN, the Proxy Server takes the interior shortcut between BLUE plus the GREEN interface, irrespective of any firewall rules.
This options only available which has a BLUE interface installed.
If enabled, clients on BLUE is only able to access web servers on BLUE or RED.
Unrestricted IP addresses optional. All client IP addresses on this list will override the subsequent restrictions:
Authentication will likely be required automagically for these addresses, but sometimes be switched off
Unrestricted MAC addresses optional. All client MAC addresses with this list will override these restrictions:
Authentication are going to be required automagically for these addresses, but tend to be deterred
Using MAC addresses rather than IP addresses may be useful in the event the DHCP service is enabled with no fixed leases defined.
The proxy server can just determine MAC addresses from clients configured to the subnets from the GREEN, BLUE or ORANGE interfaces.
Banned IP addresses optional. All requests on the clients IP addresses or subnets listed here are going to be blocked.
Banned MAC addresses optional. All requests from clients on this list is going to be blocked.
The ClassRoom Extensions CRE on the proxy server provide the ability to delegate administrative tasks to non-administrative users by way of a separate Web Access Management page.
This section defines when the world wide web proxy is active. The default position should be to allow access twenty-four hours a day, few days a week.
The Access option allow permits web access, plus the deny option blocks web access inside selected timeframe. The choice of allow or deny will depend for the time rules you would like to apply.
This section permits you to enter limits to the size of every download and/or upload request. The values are shown in Kilobytes KB. You can use this in order to avoid your Users downloading large files and slowing Internet access for every individual else.
Set the Max download size and Max upload size fields to 0, the default, to take out all restrictions.
The download bandwith may be unlimited, or limited per interface, and/or per host, or based around the type of content.
Bandwidth limits is usually defined per interface as a possible overall limit, and per host. The used bandwith for those hosts will probably be limited with the overall limit.
By default, throttling affects lots of traffic, but throttling might be limited to certain kinds of content. However, this disables throttling for other content.
Figure 2.25. Web proxy - Time restrictions, Transfer limits Download throttling Sections
The MIME type filter may be configured to close content according to its MIME type.
Enabled. If enabled, the filter checks all incoming headers with regards to MIME type.
Block these MIME types optional. If the requested MIME type is listed to get blocked, having access to it is going to be denied. This way you are able to block content, no matter what sort of file name extension is employed.
For example, add this MIME type using one line if you would like block the download of Word files:
Or, add these MIME types, each type using a separate line, if you would like block the download of MPEG and QuickTime videos:
Do not filter these destinations optional. Use this list to stop MIME type filtering particular destinations. This really should be a list, each one with a separate line, of Domains or Subdomains, Hostnames, IP Addresses, or URLs.
Enable browser check. Check this box if you wish to enable browser checking.
Allowed clients for web access. Check the correct boxes for permitted clients.
Figure 2.26. Web proxy - MIME type filter Web browser Sections
This allows the advance of some HTTP header fields to guard your privacy.
Fake useragent listed in external sites optional. By default, the useragent in the currently used web browser is going to be submitted to external web servers. Some dynamic websites generate the content depending about the submitted useragent string. This string can also be logged on the Web Server log files.
With the Fake useragent option you've the chance to rewrite this string for all your customers. For outgoing requests the useragent header field will probably be changed with the proxy server and listed in external sites instead on the original useragent string. This can be handy to protect your privacy or even enforce a desired a higher level compatibility.
Fake referer listed in external sites optional. When clicking a web link, the cause URL will likely be submitted towards the destination website. This is usually turned off by entering a person defined string. This string is going to be submitted instead on the real referring URL. This are needed to protect your privacy.
Modifying the referer violates the HTTP standard and may even sometimes bring about difficulties. Some websites are blocking requests through an invalid referer to safeguard themselves against what are named as deep links and the abuse by stealing graphics using their company website.
Redirectors work using the proxy to filter and redirect online traffic based on rules which could include blacklists, whitelists, time limits etc.
Enabled. Check the box to allow redirectors.
Number of redirector processes. You can increase or decrease the amount of active filter processes. The variety of processes depends with your hardware performance, your bandwidth along with the concurrent amount of clients. The default value is 5.
Available redirectors. Lists the redirectors installed, and and that is active. URL Filter, within this example.
The Web Proxy offers several strategies to user authentication.
None default. Authentication is disabled. Users will not need to authenticate when accessing internet websites.
Local. This authentication method could be the preferred solution for SOHO environments. Users have to authenticate when accessing websites by entering a valid details. See the Local Proxy Authentication section additional information.
identd. This authentication method may be the preferred solution for environments where
The identd authentication method requires an identd service or daemon running around the client. See the identd Authentication section for more information.
LDAP. This authentication method could be the preferred solution for medium and larger network environments. Users must authenticate when accessing internet websites by entering a valid account information. The credentials are verified against a Server while using Lightweight Directory Access Protocol LDAP.
LDAP authentication are going to be useful if you could have already a directory service as part of your network and don't want to maintain additional user accounts and passwords for web access. See the LDAP Authentication section additional information.
Windows. This authentication method could be the preferred solution for small , medium network environments. Users should authenticate when accessing websites. The credentials are verified against a Server acting to be a Domain Controller. See the Windows Authentication section for even more information.
RADIUS. This authentication method could be the preferred solution for small, and medium network environments. Users will need to authenticate when accessing internet websites. The credentials are verified against another RADIUS server. See the RADIUS Authentication section for additional information.
When using authentication and enabling the internet proxy log files, the requesting user name is going to be logged in addition on the requested URL. Before enabling log files when using authentication, be sure not to violate existing laws.
Clear cache. You can flush all pages out from the proxy cache any time by clicking the Clear cache button.
Save. After creating any changes, press the Save button to utilize them.
2.5.2. URL Filter Administrative Web Page
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A large amount of you probably know already my disdain for desktop anti-virus as a consequence of how sluggish commemorate your computer and just how it actually gets to be more of a liability regarding security. Ive discussed how wonderful it will be if you could run your anti-virus on the gateway to guard all within your computers.
February 15, 2008 - - 04:42 GMT 20:42 PST
A large amount of you probably already know just my disdain for desktop anti-virus as a result of how sluggish commemorate your computer and ways in which it actually grows more of a liability with regard to security. Ive discussed how wonderful it will be if you could run your anti-virus for the gateway to guard all of one's computers. The one thing I couldnt really supply until recently is when you actually implement this that has a practical and relatively cheap solution.
One from the things a wide range of people did would have been to take a classic computer that made a wide range of noise and possibly takes a wide range of power which adds up within the electricity bill. Another option ended up being to buy a 600 embedded appliance which should be to expensive. The third option which Justin James attempted ended up being order something right from China which took nearly two months along which has a steep money transfer fee and shipping costs. I got so desperate that I even thought the Apple TV will make a nice low-power cheap appliance only to discover that the EFI BIOS was going to get a pain to cope with.
A year has gone by and Im very happy to inform you the bad past are over and it is possible to finally obtain a low-cost low-powered x86 appliance for the little over 330 without the need of gimmicks or hacks. Enter Logic Supplys Perimeter B4 appliance for 291 including 3 gigabit ports and 1 FastEthernet port as shown within the picture above and below which I got an opportunity to review. Its an exciting metal chassis that could be mounted around the wall or merely placed inside corner somewhere. See gallery to get a closer look.
This particular model came having a 2.5 disk drive and 512 MB RAM, nevertheless the current model on the market only has 256 MB RAM and 256 MB flash. Im not sure why they no more offer the hard disk and more memory option online but you could possibly custom order it. If not, you'll be able to buy 512 MB of DDR2-533 memory for 9 including shipping along with a 20 GB 2.5 harddrive for 29 including shipping. This will be the recommended level of memory youll requirement for running IPCopCopfilter along with the hard drive is made for transparent caching which speeds things up immensely. If you spend 14.38 including shipping for 1 GB of RAM, that might give you more room to build.
The noise level with this device is moderate while using three small fans inside 1 for CPU and a couple for chassis. Its a good deal quieter than your 1U Cisco switch or router and quieter than some PCs, however it is no silent enough for under-desk operation i believe and you might have to earn some modifications on the fan to slow them down. You can generally replace the yellow wire leading up to your fan while using red wire which cuts the voltage from 12 to five volts and will significantly slow up the fan. The temperature seemed for being low enough you could reduce the speed from the fan. I did complain to Logic Supply which they should implement variable speed fans that only increase and make noise if the system is heating up.
Inside the chassis youll locate a standard mini-ITX Jetway J7F2WE-1G motherboard with 1 GHz Via C7 processor that is plenty of performance for any gateway device such as this. Typical power consumption was around 25W in order that it should cost about 22 per year to operate 24x7 at 10 cents per kilowatthour.
Here I detached tough drive along with the Gigabit Ethernet daughter card. The hard drive is often a standard 2.5 PATA IDE hard disk mounted over a metal holder. There is just one DDR2-533 slot for memory so ensure that you buy enough memory.
The system comes using a 10/100 FastEthernet interface around the motherboard and also a 3-port gigabit Ethernet card which uses three Realtek RTL8110SC network processing chips all works with Linux and BSD. Note how the CPU in this particular appliance isnt fast enough to convert this thing into a gigabit router nonetheless its plenty fast being a gateway device. This particular daughter card actually uses the strange 120-pin plug see gallery for higher resolution image inside the picture above.
IPCop and Copfilter have the freedom Open Source applications and Justin James incorporates a simple guide on what to install IPCop here if you need to get started immediately. Ill be following up using a more detailed guide.
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