[vox-tech] How do I make SSH connect anyway if a host's IP has changed?

[Ken Bloom]

On second thought, I think that I'm getting the same IP each time, but different host keys
each time, considering my errors, and considering that I have 'CheckHostIP no' set. Error is 
included:

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that the DSA host key has just been changed.
The fingerprint for the DSA key sent by the remote host is
97:fd:25:4a:1f:c3:b4:80:9e:e7:b1:7b:0b:d6:e3:ae.
Please contact your system administrator.
Add correct host key in /home/bloom/.ssh/known_hosts to get rid of this message.
Offending key in /home/bloom/.ssh/known_hosts:4
Password authentication is disabled to avoid man-in-the-middle attacks.
Permission denied (publickey,password).


There was much rejoicing when Ken Bloom <kabloom@ucdavis.edu> spoke thus:
> The Electrical and Computer Engineering department has set up a system where, by connecting to 
> the address snake.ece.ucdavis.edu, the department hands off connections to the least busy HP 
> computer in their lab.  I was trying, today to use ssh to connect to these HP computers by 
> SSH. The first try, (and some random tries after that), SSH would connect OK. Most other 
> times, however, the remote computer would fail the test because I was being handed off to a 
> different HP system.
> 
> I am currently trying to connect using a shell script I created named snake:
> 
> #! /bin/bash
> cat > ~/.sshconfig << ENDOFCONFIG
> StrictHostKeyChecking no
> CheckHostIP no
> ENDOFCONFIG
> ssh -F ~/.sshconfig kabloom@snake.ece.ucdavis.edu
> 
> (neither of these configuration options seem to be doing the trick, even after I deleted the 
> offending key from ~/.ssh/known_hosts)
> 
> Is there any way to make SSH ignore the tests that it uses to verify host authenticity when
> I connect to snake.ece.ucdavis.edu?