Purpose of self-referential rule

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I've been experimenting with gShield trying to learn the ins and outs
of iptables.  One of the rules is generates is:

iptables -A INPUT -s 192.168.6.0/24 -d 192.168.6.0/24 -i eth1 -j ACCEPT

The source and dest are correct for my internal network, and eth1 is
the internal net.  My question is, when would the firewall ever see a
packet that could possible match this?  Any packet with a source and
destination on the same network would send the packet directly (no
routing, thus no firewall).

What am I missing?

thanks,
Kelly
--
Kelly Setzer, System Administrator/Architect - Placemark Investments
14180 Dallas Pkwy, Suite 200, Dallas, TX 75240
kelly.setzer@placemark.com  http://www.placemark.com
(972)404-8100x41 (work)       (214) 287-3464 (cell)


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