Odd dual interface issue

Box has eth0 (hostname foo) and eth1 (hostname bar). With eth0 up and eth1
down I can connect to foo fine, however I can't connect to bar. When I raise
the second interface, I can then connect to either foo or bar. This is all
normal. When I then lower the second interface, I can still connect to the
box through either foo or bar. I can actually unplug the wire from eth0 but
the box responds to either hostname via the lowered interface. Why is this
happening and how do I stop it?

Thanks,
Ryan

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In comp.os.linux.networking Ryan Lovett <(E-Mail Removed)>:
> Box has eth0 (hostname foo) and eth1 (hostname bar). With eth0 up and eth1
> down I can connect to foo fine, however I can't connect to bar. When I raise
> the second interface, I can then connect to either foo or bar. This is all
> normal. When I then lower the second interface, I can still connect to the
> box through either foo or bar. I can actually unplug the wire from eth0 but
> the box responds to either hostname via the lowered interface. Why is this
> happening and how do I stop it?

Would you mind showing us the output of '/sbin/ifconfig' and
'netstat -rn' if both devices are up? Sounds as if you had both
devices on the same subnet, you shouldn't unless you are using
the bonding driver.

--
Michael Heiming (GPG-Key ID: 0xEDD27B94)
mail: echo (E-Mail Removed) | perl -pe 'y/a-z/n-za-m/'
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Michael Heiming wrote:
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>
> In comp.os.linux.networking Ryan Lovett <(E-Mail Removed)>:
>
>>Box has eth0 (hostname foo) and eth1 (hostname bar). With eth0 up and eth1
>>down I can connect to foo fine, however I can't connect to bar. When I raise
>>the second interface, I can then connect to either foo or bar. This is all
>>normal. When I then lower the second interface, I can still connect to the
>>box through either foo or bar. I can actually unplug the wire from eth0 but
>>the box responds to either hostname via the lowered interface. Why is this
>>happening and how do I stop it?
>
>
> Would you mind showing us the output of '/sbin/ifconfig' and
> 'netstat -rn' if both devices are up? Sounds as if you had both
> devices on the same subnet, you shouldn't unless you are using
> the bonding driver.

Thanks for your reply. I do have both interfaces on the same subnet. I
was trying to setup a virtual server (ipvsadm) so that eth0 is the
interface for the box, and eth1 is the interface for a cluster of
machines on the same subnet the box will send SSH traffic to. Perhaps
this subnet wrinkle was why I wasn't able to get very far with it. Do
you have any recommendations? Also, to me this subnet issue is a little
surprising. Why does Linux behave this way?

Thanks,
Ryan