[SQU] Using ipnat with a separate transparent proxy.

Sorry if this question has been posted before, but I can't find the
answer I want in the archives. It seems to me a common enough situation.

I have an OpenBSD firewall with two interfaces (internet and internal)
running ipf and ipnat, and I want to set up Squid as a transparent proxy
on another machine inside the network.

I can set up an 'rdr' command with ipnat to redirect all port 80
requests to the proxy, but how do I allow the proxy to make port 80
requests through the same interface without being looped back?

e.g.
map tun0 172.16.0.0/16 -> 0/32 portmap tcp/udp 10000:20000
map tun0 172.16.0.0/16 -> 0/32
rdr fxp0 0.0.0.0/0 port 80 -> 172.16.0.3 port 3128 tcp

Thanks in advance.

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