Re: BUG: 2 NICs on same network

From: Jeff Garzik (garzik@havoc.gtf.org)
Date: Tue Apr 23 2002 - 08:40:13 EST


On Tue, Apr 23, 2002 at 11:39:35AM +0200, Frank Louwers wrote:
> Our situation is this: we have a server with 2 nics, each with a
> different IP on the same network, connected to the same switch. Let's
> assume eth0 has ip 1.2.3.1 and eth1 has 1.2.3.2, with a both with a
> netmask of 255.255.255.0.
>
> Now the strange thing is that traffic for 1.2.3.2 arrives at eth0 no
> matter what!
>
> Even if we disconnect the cable for eth1, 1.2.3.2 still replies to
> pings, ssh, web, ...

If the two NICs are on the same network, the kernel will send the
packets to the first available interface.

The kernel has acted like this for years...

        Jeff

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