[lug] Two NICs, one IP

[Dan Cox]

Jeff,

You could have a cron that checks if the network is accessible via one
interface (ping a known ip maybe) and if not bring the other interface up.
Or something similar.

Dan Cox

----- Original Message ----- 
From: "Jeff Schroeder" <jeff at neobox.net>
To: "Linux Users Group" <lug at lists.lug.boulder.co.us>
Sent: Wednesday, August 11, 2004 2:38 PM
Subject: [lug] Two NICs, one IP


> Hey all--
>
> I manage a Linux server for a client, and he has asked me to set things
> up so the server will be able to withstand the failure of a physical
> cable on the LAN.  The server has two NICs (eth0 and eth1, in
> Linuxspeak) and he wants both to have the same IP address.
>
> I don't believe this is possible, since the box won't know where to
> route outgoing packets (eth0? eth1? both?), and I've seen instances
> where a network interface won't even come up if the system thinks
> there's another machine with that IP on the network.
>
> However, before I tell him it isn't possible, I wanted to confirm it
> with the group here.  I don't have any hard-and-fast documentation to
> support my claim, but it just doesn't seem right to me.  Can anyone
> tell me for sure that it's not possible?  Or, if it is, how to do it
> properly?
>
> TIA,
> Jeff
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