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2 NIC and arpwatch

I have a machine with eth0 using a.b.c.2 and eth1 using
there is also an address a.b.c.251 bound to eth1:1
Technically both nics are on the same physical [switched] network.
the problem: another machine running arpwatch show me every 10 
minutes the address as flipping between the two nics ...
(while the routing works fine !).
Does someone have an idea on what is happeeninmg and how to fix it ?
(BTW if i bound the thrre addresses to the same NIC i have no problem, 
althoungh the throughtput of the router become a concern !
Leonardo Boselli
Nucleo Informatico e Telematico del Dipartimento Ingegneria Civile
Universita` di Firenze , V. S. Marta 3 - I-50139 Firenze
tel +39 0554796431 cell +39 3488605348 fax +39 055495333

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