I'm looking at a packet from a packet capture. The packet's IP address was 
sourced within our LAN, destination a server out on the Internet (it is a tcp 
ack, part of an ongoing session) The packet's mac addresses were sourced from 
the inside interface of the firewall and destination to our LAN's core router. 
Our firewall is operating in bridging mode, however, not routing. It has a 
management IP address on the inside interface, but that's it. No other IP 
address assigned.

Under what conditions would an ipfw bridging firewall grab hold of an outgoing 
packet and send it back, substituting it's own mac address for the source and 
the inner LAN router for the destination? 

TIA for any insight

Fred Portnoy
Network Analyst
Plymouth State University

"unfettered by edgy modernisms, or classical influences"
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