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New Member

Secure Shell

Does anyone have experience with installing an IOS with SSH and 3DES so that you can configure the Serial and FastEthernet interfaces of a 2621 XM router? If so, what feature set are you using?

New Member

Re: Secure Shell

I have personally instealled different IOS version of "IP/FW/IDS PLUS IPSEC 3DES", I would suggest ver 12.2.15T5, but it depends on your setup and in what exactly you looking for..

New Member

Re: Secure Shell


Im also interested in using SSH instead of telnet. What particular IOS I will need. My router and switch platforms are:1600, 1700,2500,3660 and switch are 2900, 2950 and 4006

Hope someone helps

Cisco Employee

Re: Secure Shell

Pretty much any DES/3DES feature set will do, although some don't have the SSH subroutines in them, particularly earlier code versions in 12.0 and 12.1.

You can always find a specific feature and the code for it by using the Feature Navigator, makes life very simple. Go here (, search by feature and enter SSH, it's that simple.

Once you have the right code on the router, you just need to create a public/private key pair for SSH to use (Cry key gen rsa) and you'll get a console message saying SSH has been enabled.

See for details.

New Member

Re: Secure Shell

Networkin Pros,

I have a problem with implementing SSHv1 on a 2511 Access Server. My SSH Clients that I have been trying to use: Putty and Secure CRT 4.0

This is the following output I get before the router hangs: SSH Debugging was turned on

00:29:08: SSH0: starting SSH control process

00:29:08: SSH0: sent protocol version id SSH-1.5-Cisco-1.25

00:29:08: SSH0: protocol version id is - SSH-1.5-PuTTY-Release-0.53b

00:29:08: SSH0: SSH_SMSG_PUBLIC_KEY msg

Abort a


Abort at 0x100B6DE (PC)

Please advise..Thanks

New Member

Re: Secure Shell

post your config...

New Member

Re: Secure Shell

Networking Pros,

Found the answer to my problem..

I was using single des encryption in my implementation. The RSA keys I was generating was too high for this type of encryption. I was originally using 1024-bit. When I lowered to 512 it worked..One question does one determine which rsa keys to generate with DES/3DES.

Thanks for all who attempted or was in the process of sending me a response.

New Member

Re: Secure Shell


Thanks for the previous postings, tips on ssh implementation, and for posting this definitely got me to analyze my problem step by step..and discover the error in my config.

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