natd question

[Michelle]

i am running freebsd 4.6.2.  i have 2 nic cards on the machine, one 
which is the external interface and connects to a router which connects 
to dsl.  the other is internal interface for our subnet.  i have 
enabled natd on the machine, but still cannot get packets out when on 
the subnet.  i can ssh to the external interface, but can't ssh to a 
machine that is outside of our network.  i checked ps aux to make sure 
natd is running and checked the firewall rules to make sure the natd 
divert rule is there.  is there something else i need to configure?