Try something like:

rdr de0 INETIP/32 port 80 -> 192.168.2.233/32 port 80 tcp

If that doesn't work try:

rdr tx0 INETIP/32 port 80 -> 192.168.2.233/32 port 80 tcp

I've never run NAT on a multihomed host before, but there shouldn't
be much you have to change to get things working.  I know I had to
fiddle with things until I got NAT to work properly, but I don't quite
remember what I did :P

HTH,
Eden Li

From: "Mike Starke" <mgcon@neta.com>
> rdr de0 INETIP/32 port 80 -> 192.168.2.233/32 port 80