Knowledgebase: Getting Started
Work-around for Vigor2820 session limit bug
Posted by on 03 February 2012 01:49 PM

Problem

A problem exists with the latest firmware (version 3.3.5.1 and 3.3.5.2) with session control in the router.

For example, unable to turn off the session control when  multiple torrents sessions are running (e.g. 10 users)  on the network the router  can easily reach its
limit quickly and effectively stop the entire network.

Error message displayed:

“You have reached the maximum number of permitted Internet sessions.
Please close one or more applications to allow further Internet access.
Contact your system administrator for further information.”

Work-Around Solution

As an interim measure until the new firmware becomes available, try the following procedure:

Use telnet command 'portmaptime - 'to setup session timeout value to ease this problem.

Example,your session limit is 1000 and it shows you have 1000 tcp sessions currently,but 500 is old sessions.

Default TCP timeout is 86400s.So old sessions not being released so fast.

You can use 'portmaptime -t 60' to setup TCP timeout as 60s.

Then old sessions can be released after 60s.

You can also use this command to setup UDP,ICMP...timeout value.

Then it can't easily reach its limit quickly and effectively stop the entire network.

 

Using Mac

Use terminal to telnet to the router.

telnet ‘IP address of the router’

Account: admin

Password: ‘password of your router’s admin page’

Then type 'portmaptime -t 60'

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