[PLUG] ARP black magic question

[Eric Harrison]

It appears I am in the need of being hit upside the head with the
clue stick ;-)


One particularly complex load-balancing setup we have is in need of
a little arp black magic: I need server A to answer arp requests on
behalf of server B.

That is, when some random host sends out an arp query "who has serverb?",
Server A needs to respond "serverb is at 01:02:03:04:05:06", where 
"01:02:03:04:05:06" is the real MAC address for server B. 

I'm not having much luck figuring out how to do this and all of the
docs I can find cover how to hijack an IP via arp & proxy arp. Neither
of these fit my scenario. 

Has anyone here setup something like this up? Given how much trouble I'm
having I assume there is an embarrasingly simple solution ;-)

-Eric