> We would like the default arp processing to allow use to 
> control traffic into
> a box (thru a switch) by specifying which IP address certain 
> processes send to.
> When each box sends 2 arp replies, things get messed up 
> (unless we ignore 
> these replys and make all our arp tables static). 

If you have a switched subnet and machine A sends to interface 2 on machine B 
(received that arp reply first) and machine B uses interface 1 to reply, the 
switch will forget after some time about interface 2 of machine B and to 
broadcast all the traffic to this destination (until machine B sends something 
out of interface 2).

If you want to do loadsharing with the two interfaces, you will often end up 
just using one (unless you use static arp).

I can only see problems with current behavior of Linux. Are there any 
advantages?

-Tilo

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