Ubuntu Security and 2 nic's

I have an a Ubuntu setup with 2 nic's. I have some computers trying to
communicate with a ip address that we filter out of our router. I have
created a VLAN of the offending ip address and I now have eth0 on Ubuntu
box assigned to that IP. For logging purposes I want to be able to
connect to the box on another nic and see the traffic that is coming
into the nic with the offending ip. I WANT to make sure that traffic is
not routed between the 2 nic's how can I do that. I do not want any
routes or bridging to happen between the 2 nics. Any advice on how to
do this?


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