dual-net problem
Jeff Vian
jvian10 at charter.net
Wed May 25 19:46:36 UTC 2005
On Wed, 2005-05-25 at 19:02 +0100, T. Horsnell wrote:
> Hi all,
> I have a system with dual gigabit ethernet ports.
> I've assigned them each an ip address, and am using
> tcpdump and ping to check that they work as expected.
> They dont.
>
> If I ping, from another box, the address associated with eth1,
> the traffic appears on eth0. This only happens when I ping from
> another Linux box - if I ping from one of my Alpha boxes, everything
> works as expected, i.e. pings addressed to the ipaddress
> allocated to eth0 appear on eth0, and pings to the ipaddress
> allocated to eth1 appear on eth1.
>
> I'm running FC3 with kernel 2.6.10 on the dual-eth box, and I've
> tried pinging from RH7.3, RH9 and FC3 boxes, all with the same
> result.
>
> It appears from the tcpdump output below, that ls1 is returing the
> mac address of the eth1 interface *and* the address of the eth0
> interface. Is this proper? What am I doing wrong?
>
> Cheers,
> Terry.
>
You are using 2 interfaces on the same subnet on this machine. This has
historically never worked reliably.
If you put one of the interfaces on one subnet and the other on a
different subnet I expect it will work better (and as expected).
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