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IMFirewall Blog - Wednesday, August 05, 2009
Block Internet Access,Block P2P,Web Filtering
 
# Wednesday, August 05, 2009
  Internet can be a benefit to business when used properly, but internet is often abused by employees and poses significant liability and security risks. In today's internet, P2P programs and IPTV applications can easily consume most of your bandwidth.
  Therefore, monitoring of internet activity and monitoring of bandwidth usage is important to keep your business efficient.
  Below I list several aspects to monitor internet usage on company network.

How to monitor internet usage?

  You can not monitor other computers internet usage in a network unless you have access to their network traffic.
  There have two ways to see other computers internet traffic:
  1. Configure a span port(port mirroring) in your switch.
  2. Do monitoring in the gateway or proxy.

  If you already setup a computer as the gateway or proxy server, you just need to install internet monitoring software in the server to do monitoring. 
  Since many networks are using a router as the gateway, using a port mirroring switch is a good choice. Port mirroring allows you to setup a port in the switch to receive packets of other ports. Setting up a mirror port does no change to your network topology, and it will not affect your network speed.  A broadcasted hub can also help you to do monitoring, however, broadcasted hubs can only work in 10M bit mode, and it is not so stable. Therefore I recommend you not to use a broadcasted hub to do monitoring.
  Read this example for details to setup port mirroring: Deploy internet monitoring using a port mirror switch .

How to monitor internet connections?

  Once you've setup the span port, you can easily monitor internet connections using internet monitor software.
  Here we take "WFilter Enterprise" as an example:

Monitor all computers internet connections

   Use WFilter's "Active Connections" feature, you can have a clear view of all connections in your network.






Monitor a computer's internet connections


Connections of a particular computer, you can kill established connections if you want.



How to monitor internet activity?


   In "Online computers", click the numbers under each title to view detailed records.





Browsing history:








Other related links:
How to monitor internet bandwidth?
Internet blocking

Wednesday, August 05, 2009 2:05:28 PM (GMT Standard Time, UTC+00:00)    Deployment | How to block internet | How to monitor internet usage | Internet monitor | Internet Monitoring  |   |  Trackback
# Friday, July 17, 2009

Introduction

WFilter supports various ways to filter web surfing activity:

  1. Block Web Surfing Completely
  2. Enable Website Black/White List
  3. Enable URL Keywords Filtering
  4. Enable Website Category Access Policy
  5. Websites Exception List
  6. Enable HTTPS Black/White List

1. Block Web Surfing Completely

When enabled, all HTTP web surfing will be blocked, except for domains in the "Websites Exception List".

1.1 Add a new blocking level, as in the below figure:



Figure 1

1.2 Set a proper "Level Name" and "Level Desc", check the "Block Web Surfing". If you want to display a blocking page when blocked, you need to enable "Display a Deny Page When Blocking", as in Figure 2:



Figure 2

1.3 Apply this new blocking level to certain users in "User-computer Table", as in the below figure:



Figure 3

1.4 Websites will be blocked, as in Figure 4:



Figure 4



Figure 5

2. Enable Website Black/White List

Website black/white list can set black list or white list for websites based on domain name. When black list is enabled, websites in the black list will be blocked. When white list is enabled, only websites in the white list can be visited.

2.1 Add a new blocking level, as in the below figure:



Figure 6

2.2 Set a proper "Level Name" and "Level Desc", check the "Enable Website black/white list", as in Figure 7:



Figure 7

2.3 Add certain websites into a black list, as in Figure 8:



Figure 8

2.4 Apply this new blocking level to certain users in "User-computer Table", as in the below figure:



Figure 9

2.5 Websites in the black list will be blocked, as in Figure 10:



Figure 10



Figure 11

3.1 Enable URL Keywords Filtering

URL keywords filtering can filter webpages by url address. Using this feature, you can block searching for certain keywords in search engines.

3.1 Add a new blocking level, as in the below figure:



Figure 12

3.2 Set a proper "Level Name" and "Level Desc", check the "Enable URL Keywords Filtering", as in Figure 13:



Figure 13

3.3 Check the keywords category to be blocked, as in Figure 14:



Figure 14

3.4 Apply this new blocking level to certain users in "User-computer Table", as in the below figure:



Figure 15

3.5 In this example, searching for "game" will be blocked, as in Figure 16 and Figure 17:



Figure 16



Figure 17

4. Enable Website Category Access Policy

Website category access rules can filter websites based on websites categories. Four filtering modes are supported: "Allow", "Deny", "Warn" and "Time Quota".

4.1 Add a new blocking level, as in the below figure:



Figure 18

4.2 Set a proper "Level Name" and "Level Desc", check the "Enable web category rule", as in Figure 19:



Figure 19

4.3 Set certain filtering mode for certain categories, as in Figure 20:



Figure 20

4.4 Apply this new blocking level to certain users in "User-computer Table", as in the below figure:



Figure 21

4.6 In this example, time quota is enabled for "Game" websites, as in Figure 22:



Figure 22

5. Websites Exception List

Websites in the exception list will not be blocked by other rules.



Figure 23

6. Enable HTTPS Black/White List

Above functions can only filter HTTP websites, to block HTTPS websites, you need to enable the "HTTPS Black/White List".

6.1 Add a new blocking level, as in the below figure:



Figure 24

6.2 Set a proper "Level Name" and "Level Desc", check the "Enable HTTPS Black/White List", as in Figure 25:



Figure 25

6.3 Add certain websites into a HTTPS Black list, as in Figure 26:



Figure 26

6.4 Apply this new blocking level to certain users in "User-computer Table", as in the below figure:



Figure 27

6.5 As in Figure 28 and 29, certain HTTPS websites will be blocked.



Figure 28



Figure 29





Friday, July 17, 2009 3:45:37 AM (GMT Standard Time, UTC+00:00)    Content Filter | Deployment | How to block websites | How to filter internet access  |   |  Trackback
# Monday, April 20, 2009

WFilter Monitoring Performance

WFilter is designed to monitor a network with no more than 1000 computers, and the available internet bandwidth of the entire network shall be no more than 100Mbit/s.

Since WFilter is software, the performance depends a lot on the hardware performance. Higher bandwidth requires faster CPU, and more monitored computers require more RAM. Therefore, we recommend you to provide 1M available RAM for each monitored computer.

Below is a performance test result for HTTP request of WFilter 3.3 file-based version:


#ComputersBandwidthTotal HTTP RequestsRecorded PercentCPUMemory
15037.2M16000100%35%260,298K
210035M20000100%38%280,576K
320031M40000100%58%294,561K
440033M80000100%68%372,786K
560032.3M120000100%80%540,151K
6100032.6M20000060%99%540,664K

As we can see from the above table, when monitored computers number reachs 1000, the "recorded percent" decreased to 60% suddenly. And we noticed the memory only slightly increased, so it shall because lack of memory. Therefore we added the monitoring computer RAM to 2G, and do the test again:

#ComputersBandwidthTotal HTTP RequestsRecorded PercentCPUMemory
7100032.7M200000100%90%820,640K

And the test of WFilter 3.3 database version(SQL Server) performance has the similar result:

#ComputersBandwidthTotal HTTP RequestsRecorded PercentCPUMemory
15034.9M10000100%45%197,392K
210034.9M20000100%45%210,196K
320031M40000100%45%270,960K
440032.9M80000100%45%364,234K
5100028.6M20000058.84%100%540,664K

The performance of 1000-user can also be improved by adding RAM of the monitoring computer.

Test Environment

1Network100M ethernet
2Test ClientIntel(R) pentium(R) Dual 1.80+1.80GHz , 1G RAM
3Test Monitoring ServerIntel(R) Celeron(R) 2.66GHz, 1G RAM
4WFilter VersionWFilter 3.3
5SwitchTplink TL-SF1008



Monday, April 20, 2009 6:34:35 AM (GMT Standard Time, UTC+00:00)    Block Messenger | Block P2P | Chat Monitor | Content Filter | Deployment | How to block p2p | How to block websites  |   |  Trackback
# Wednesday, January 07, 2009
  WFilter 3.3 is under alpha testing now. The new version will add "Bandwidth limit", "Url keywords blocking", "Website visit quota" and other exciting features.
  1. "Bandwidth limit". You can set bandwidth limit for each computer, or blocking certain internet traffic when internet bandwidth is too high. This feature can help you to manage company bandwidth flexibly.
  2. "Url Keywords Blocking", blocking url/webpage by keywords category. You may use this feature to block certain keywords from being searched in search engines.
  3. "Website visit quota", by this feature, you are able to set visit time quota for each website category. For example, "news" websites can be limited to "1 hour" for each day.


 

Wednesday, January 07, 2009 5:37:21 AM (GMT Standard Time, UTC+00:00)    Block Messenger | Block P2P | Chat Monitor | Content Filter | dasBlog | Deployment | How to block p2p | How to block websites  |   |  Trackback
# Thursday, December 25, 2008
     It is said that Google talk uses Jabber protocol to communicate.
     However, Google talk has more flexible ways to connect:
     1. Using Jabber standard tcp port 5222.
     2. Using TLS port 443.
     3. Using web chatting on port 80.

     So you will not able to block Google talk by simply blocking Jabber standard port. And 443, 80 ports are essential internet ports which shall not be blocked.

     WFilter makes it simple to block google talk. Google talk connections can be identified and blocked by signature matching. And all these can be done just by one click as below:



     More information, please refer to: http://www.imfirewall.com/en/protocols/Jabber.htm.

Thursday, December 25, 2008 5:01:43 AM (GMT Standard Time, UTC+00:00)    Block Messenger | Chat Monitor  |   |  Trackback
# Thursday, May 15, 2008

Some websites, like facebook, youtube, are rather time consumable.

If you do nothing to filter certain websites, your employees may spend several hours a day on web surfing.

So How to block certain websites to save your productivity?

1. Some router/gateway might have the ability to block certain websites.

2. Firewall appliances, like cisco PIX, will also be a good choice.

3. The third, you can choose internet filtering software to do web filter and blocking.

 

 

 

Thursday, May 15, 2008 10:56:13 AM (GMT Standard Time, UTC+00:00)    Content Filter | How to block websites  |   |  Trackback
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