#6 bridge responding to arp request ?

[Anonymous]

Hi, I'm trying to build a netFlow probe, my machine has 3 interfaces :
eth0 wich used for ssh administration and netflow export.
eth1 and eth2 which are set to bridge for listening trafic.(unsing brctl 1.4)

Since the bridge has no ip, it is totaly silent on the IP level.
However, it sometimes respond to some arp request that are intended to eth0 (eth0 also answer just miliseconds later)
Is this behavior normal ? (I think not, but I'm no network expert)
Is there a way to render the bridge totaly silent ?

(English not being my mother tongue, my question might be unclear. please let me know.)

[Nobody/Anonymous]

my interfaces config.