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What is a session ?
It is a logical connection created between two nodes to exchange data. Typically, a session contain the following info :
Destination IP address
Source IP address
Protocol Type (TCP/UDP/ICMP)
Destination Port
Source Port
For example :
Sending e-mail use 1 session. Receiving e-mail use 1 sessions. Telnet ( BBS ) use 1 session. Surfing the Web use N sessions. ( N is about 10 ) Downloading files use N sessions. ( FTP download use 1 session. But P2P download use may more sessions. For example eMule can use about 1000 sessions for downloading )
A Vigor router, for example, might support for up to 15000 simultaneous sessions. As you can see if many users on your LAN are using P2P download, they will use most sessions and occupy over resources which might result in important accesses impacted. To solve the problem, you can use the Session Limit feature to restrict LAN clients identified by their IP address.
Here is an example which tells you how to use Sessions Limit feature :
First select Enable. When you define the Default Max Sessions, it will be applied to all the devices on the LAN. In addition you can define more Specific Limitations for single and/or ranges of IP Address. Enter the Start IP and End IP of the computers you wish to limit, along with the maximum number of Sessions allowed. If the setup is just for one single IP Address set the Start IP and End IP the same.
In this example, the devices with IP 172.17.1.20 and 172.17.1.21 can use at most 1000 sessions; the device with IP 172.17.1.22 can use at most 2000 sessions. The left devices can use at most 1500 sessions each.
Note : Specific Limitation has higher priority than Default Max Session.
After finishing the configuration of Session Limitation, we can monitor the Data Flow in Data Flow Monitor page.
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Page last modified : 13 October 2008 |