divert with ipnat instead of ipfw?

[Norberto Meijome]

Hi all,
My setup :
--
FreeBSD hostname 4.10-PRERELEASE FreeBSD 4.10-PRERELEASE #2: Wed Apr 28 
09:40:43 EST 2004

fxp0 : link to the outside world
fxp1 : link to LAN
fxp2 : link to DMZ

ipf firewall
ipnat for LAN and rdr for services.
--

I'm running tcpmssd to fix MSS:

/usr/local/bin/tcpmssd -p 1000 -i fxp2

and I have the ipfw line that redirects all the traffic from fxp2 into 
tcpmssd:

ipfw add divert 1000 tcp from x.x.x.x/y to any out via fxp0 setup

(where x.x.x.x/y is the subnet behind fxp2).

This works fine, but I was wondering how to do this with ipnat's rdr 
configuration line (rather keep ipfw for bwlimiting). I haven't managed 
to figure out how to redirect ALL traffic from fxp2 to that port. I can 
do it on a port by part basis, but I need all traffic to go through it.

I tried :
rdr fxp2 0.0.0.0/0 port 0-65535 -> 127.0.0.1 port 1000

but tcpmssd with -v showed no made.

ipfw not used for anything else right now.

Any hints?

Thanks!!
Beto