Stop sniffing Extra packets

[Curtis Wyatt <zhackwyatt () gmail com>]

Hello all,
I have a box with two Nic cards, when I sniff a packet on one I encapsulate it and then send it out on the other Nic.  
I need to do this for both Nics.  However when I send it out using a raw socket libpcap is picking it up on the other 
Nic.  Is there anyway to prevent this? I can't figure out how to set up filters to stop this.

Thanks-
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