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Limiting telnet sessions

I am looking to limit the number of telnet sessions to some of my equipment. Can anyone point me in the right direction on how to do this?

  • Other Security Subjects
3 REPLIES

Re: Limiting telnet sessions

Depending of the cisco device .. you could configure a password or aaa access for the first vty lines .i.e line vty 0 2 ( will give you 3 simultaneous telnet sessions ) and then leave the other vty lines with no password ot aaa access line vty 3 15 . Unfortunatley you can do this on a PIX which be default support up to 5 telnet sessions.

I hope it helps ... please rate it if it does !!!

Hall of Fame Super Silver

Re: Limiting telnet sessions

As Fernando points out, limiting telnet access involves controlling the vty ports. His suggestion of configuring authentication for some ports and not for others is one approach. I believe that there is a more simple and direct approach. After you decide how many vty lines should be activated, configure this on the vty lines that you do not want to be active:

no exec

This will prevent those vty ports from starting an exec session which inherently prevents telnet access to them.

HTH

Rick

New Member

Re: Limiting telnet sessions

Thanks for the info, right now if I have line vty 0 1 (which should give me 2 telnet connections). However, new VTY lines are being created as needed. I was looking at the line vty session-limit but for some reason that command is not available on any of my equipment (2950's, 3550's, 3560's).

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