[lug] Two NICs, one IP

Shannon Johnston sjohnston at cavionplus.com
Wed Aug 11 15:05:52 MDT 2004


There is a way to do it. 
I have two systems here running that way, I just can't remember how I
did it. 
I'll dig through my bookmarks and see what I can find.


Shannon


On Wed, 2004-08-11 at 14:38, Jeff Schroeder wrote:
> 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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-- 
Shannon Johnston <sjohnston at cavionplus.com>
Cavion Plus
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