SSH v1.99 VS v2.0

Unanswered Question
Apr 4th, 2012
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hi all,


is there a really big difference between the two SSH versions? i initially thought that version 1.99 is "the" 2.0.


Router#show ip ssh

SSH Enabled - version 1.99

Authentication timeout: 120 secs; Authentication retries: 3

Router1#conf t

Enter configuration commands, one per line.  End with CNTL/Z.

Router1(config)#ip ssh version 2

Router1(config)#end

Router1#show ip

*Apr  5 10:11:02.123: %SYS-5-CONFIG_I: Configured from console by console

Router1#show ip ssh

SSH Enabled - version 2.0

Authentication timeout: 120 secs; Authentication retries: 3

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darren.g Wed, 04/04/2012 - 22:07
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johnlloyd_13 wrote:


hi all,


is there a really big difference between the two SSH versions? i initially thought that version 1.99 is "the" 2.0.


Router#show ip ssh

SSH Enabled - version 1.99

Authentication timeout: 120 secs; Authentication retries: 3

Router1#conf t

Enter configuration commands, one per line.  End with CNTL/Z.

Router1(config)#ip ssh version 2

Router1(config)#end

Router1#show ip

*Apr  5 10:11:02.123: %SYS-5-CONFIG_I: Configured from console by console

Router1#show ip ssh

SSH Enabled - version 2.0

Authentication timeout: 120 secs; Authentication retries: 3


SSH version 1.99 is merely an indication that the server supports both SSH version 2 *and* SSH version 1.


It's not really a version, as such, but an indication of backward compatibility.


See


http://en.wikipedia.org/wiki/Secure_Shell


By seting your SSH config to V2, you're disabling V1 backward compatibility (not necesarily a bad thing, given V1's well-known and documented security holes).


Cheers.

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