ssh confusion

[Dazed_75]

Interesting.  I deleted entry 8 and then ssh'd to lapdog0 with no
complaint.  Logged out, rebooted that machine to Mint and then ssh'd into
lapdog1 and that complained about then new entry 23 for lapdog0.

It appears that ssh will make an entry in known_hosts for each IP and
something (host name, kernel, tennis ball) combination, but only complains
about the 1st mis-match it finds.  Whatever the "something" is is not clear
as I got no complaint after deleting entry 8 (from the lapdog2 days) and
sshing in to lapdog0.  Puzzling.

On Fri, Nov 30, 2012 at 5:01 PM, Dazed_75 <lthielster at gmail.com> 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 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
> from a forwarded message body before clicking Send.
>
>


-- 
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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