problems port forwarding with natd

Alright,

I am trying to forward http requests to the outside interface on my freebsd firewall to an internal host. I have natd redirect (supposedly anyways) like this:

natd -n tun0 -redirect_port tcp 192.168.10.53:80 80

i allow access through ipfw like this:

${fwcmd} add allow log tcp from any to ${ext_net} http keep-state
${fwcmd} add fwd 192.168.10.53,80 log tcp from any to ${ext_net} http in
${fwcmd} add allow log logamount 500 tcp from any to 192.168.10.53 80

and i can see http requests being accepted in the logs, but they aren't being forwarded onto the machine like they should. natd is working fine otherwise. am i doing something wrong?

thanks