when routing packets to another interface, is it then possible to do redirection

for those packets on the other interface ?
I am trying to:

- route subnets to a tunnel

- redirect the subnets to private ip
10.100.1.1 ----> bge0 --- route-to ---> tun0 --- rdr 10.100.1.1 -> 192.168.1.1
I am seeing mostly
2007-02-14 15:29:43.043821 rule 1/0(match): pass out on tun0:

172.16.11.24 > 10.100.1.1: ICMP echo request, id 512, seq 20225,

length 40
So no rdr. Its probably supposed to work like this, but I lack some pf

understanding

I guess...... if someone could drop some hints it would be nice.
Test box is freebsd btw. If above setup will work on openbsd with

multiple routing tables, etc, etc, please let me know.