On Mon, Jun 23, 2003 at 05:01:40PM -0300, Diego Woitasen wrote:
> Why the kernel answer ARP request when these enters by a different
> interface from which has the ip in question?
>
> For example:
>
> lo:0 = 10.10.10.10
> eth0 = 10.10.10.11
>
> If an ARP request for 10.10.10.10 arrive at eth0, the kernel send a
> reply, but this address is not attached to eth0.
>
> Is this a bug or is intentional?
It's intentional behaviour.
You can disable it if you want, take a look at
Documentation/networking/ip-sysctl.txt (from your linux kernel source),
look up arp_filter and there's a nice description about it.
IIRC there were a couple of threads sometime ago (last year?) here or on
netdev about it.
Alternatively, you can take a look at ARP tables support on 2.5 but I
can't recall if they have userspace apps yet.
Thanks,
Alberto
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