The problem is the entry in your known_hosts file. Previously the name / 
ip relationship  was different and now it is different. You can safely 
remove the entry for that ip/name from /home/larry/.ssh/known_hosts . 
The next time you ssh, you will be asked , and once you press yes, it 
should be fine there after.

Thanks

*Amit K Nepal
Infrastructure Engineer (RHCE)
omNovia Technologies Inc. <http://www.omnovia.com>
Amit K Nepal <http://www.amitnepal.com>
<http://www.amitnepal.com>*
On 11/30/2012 5:01 PM, Dazed_75 wrote:
> I am able to ssh to a machine on the LAN using either host name (my 
> router has dnsmasq turned on) or IP.  That works just fine.
>
> My confusion started when I took a machine called lapdog2 which used 
> to dual boot Vista and Ubuntu (through several releases) with both 
> named lapdog2.  I would ssh into Ubuntu there with no problem.
>
> I just replaced the hard drive and only installed ubuntu 12.10 and 
> LinuxMint 14 as a dual boot (yes, it is a bit redundant but I had my 
> reasons) and named them lapdog0 and lapdog1 respectively.  I can still 
> ssh by name or IP but ssh tells me every time that the host key for 
> that IP differs from the one stored when it was lapdog2 (entry 8):  It 
> does not seem to tell me there is any difference for lapdog0 (entry 
> 22) vs lapdog1 (entry 23):
>
>     larry@hammerhead:~$ ssh lapdog1
>     Warning: the ECDSA host key for 'lapdog1' differs from the key for
>     the IP address '192.168.2.124'
>     Offending key for IP in /home/larry/.ssh/known_hosts:8
>     Matching host key in /home/larry/.ssh/known_hosts:23
>     Are you sure you want to continue connecting (yes/no)? yes
>     Welcome to Linux Mint 14 Nadia (GNU/Linux 3.5.0-17-generic i686)
>
>     Welcome to Linux Mint
>      * Documentation: http://www.linuxmint.com
>     Last login: Fri Nov 30 16:40:24 2012 from hammerhead.thiel.org
>     <http://hammerhead.thiel.org>
>     larry@lapdog1 ~ $ logout
>     Connection to lapdog1 closed.
>     larry@hammerhead:~$ ssh lapdog0
>     Warning: the ECDSA host key for 'lapdog0' differs from the key for
>     the IP address '192.168.2.124'
>     Offending key for IP in /home/larry/.ssh/known_hosts:8
>     Matching host key in /home/larry/.ssh/known_hosts:22
>     Are you sure you want to continue connecting (yes/no)? yes
>     Welcome to Ubuntu 12.10 (GNU/Linux 3.5.0-18-generic i686)
>
>      * Documentation: https://help.ubuntu.com/
>
>     14 packages can be updated.
>     13 updates are security updates.
>
>     Last login: Fri Nov 30 16:21:16 2012 from hammerhead.thiel.org
>     <http://hammerhead.thiel.org>
>     larry@lapdog0:~$
>
>
> The only thing I can think of is that the name does not matter (it was 
> just resolved by dnsmasq to the same IP) and the old ubuntu was on a 
> different kernel (one of you told me once that the kernel matters for 
> ssh by ECDSA key).
>
> But then why would keys 22 and 23 both be used and without complaint 
> between them?  What am I missing?
>
> -- 
> Dazed_75 a.k.a. Larry
>
> Please protect my address like I protect yours. When sending messages 
> to multiple recipients, use the BCC: (Blind carbon copy). Remove 
> addresses from a forwarded message body before clicking Send.
>
>
>
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