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Telnet Port!?!?

Does anyone know how to make a Cisco router answer telnet requests on a different TCP port than 23? There HAS to be a way to do this, but after much searching, I cannot find any information on it!

Thanks kindly!

Jeremy Cioara

6 REPLIES
Bronze

Re: Telnet Port!?!?

When I checked into it it couldn't be done. Recent IOS' added support for SSH. That and the HTTP interface are the only other ways to access it that I could find. I'll be watching to see if you get any useful answers.

Re: Telnet Port!?!?

I dont think current IOS supports this (though havent seen the chances of having a undocumented IOS command).

New Member

Re: Telnet Port!?!?

The only way I've found is to use NAT.

-A

Re: Telnet Port!?!?

As Asbjoern suggested, NAT is one way of changing the port on which you can telnet to a router.

int s0

ip nat outside

ip add 10.1.1.2 255.255.255.0

ip nat inside source static tcp 10.1.1.2 23 10.1.1.2 30

When you telnet to 10.1.1.2 you will need to use port 30 instead of 23.

HTH

New Member

Re: Telnet Port!?!?

Excellent advice HTH - your simple NAT config works flawlessly.

Thanks kindly!

Jeremy

Re: Telnet Port!?!?

Hi Jeremy,

HTH - Hope that helps!

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