ssh confusion

[Dazed_75]

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 at 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
> larry at lapdog1 ~ $ logout
> Connection to lapdog1 closed.
> larry at 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
> larry at 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
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