ip masquerading

[bruce]

hi...

i have a situation where i have a system with two connections, one wireless,
one eth connetion. i can currently connect with the wireless ath0 to my
network/internet/etc...

however, when i activate the eth0 at the same time, i can't access the
network via ath0. as far as i can tell, i need to implement ip masquerade to
have eth0 map, to ath0...

my test ip addresses are:
 ath0 - 192.168.1.33
 eth0 - 192.168.2.33

any thoughts/comments/pointers...

thanks