> Example, machines A,B,C all have the same IP on a lookback or
> dummy interface. A load director/etc is currently routing all traffic
> to the cluster IP to machine A.
>
> Should machine Bs interface get into PROMISC mode all packets
> (even though they are sent to another MAC addr) will hit the IP layer,
> and should the IP be found on a local interface, the machine will
> respond.
This is not true. When an interface in promisc mode receives a packet
not destined at its MAC address and not a {broad,multi}cast it sets its type
to PACKET_OTHERHOST. arp_rcv ignores such packets. IP does the same check.
-Andi
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