[CentOS] Can't get forwarding to work

[Barry Brimer]

> I changed my rules to these:
>
> /sbin/iptables -t nat -A PREROUTING -d $WIN_EXTERNAL_IP -j DNAT --to
> $WIN_INTERNAL_IP
> /sbin/iptables -t nat -A POSTROUTING -s $WIN_INTERNAL_IP -j SNAT --to
> $WIN_EXTERNAL_IP
>
> And I am still not seeing anything log on the firewall log
> and the connection is not working.

I don't believe you need the forward rule since you're doing NAT.  What 
does your entire NAT table look like?