enable in > NAT> outgoing "Enable advanced outbound NAT"
then you can edit NAT manually for your LAN.
> At a particular site I have 2 m0n0 boxes each in front of independent ADSL
> connections (one is 1024/256, the other is 256/256). Aim is to use the 1mb
> line for general web access with the 256k synchronous one for VoIP traffic
> through an Asterisk server.
> I've configured the m0n0 on the faster connection as the DHCP server and
> defined a static route to the VoIP gateway (a.b.c.d) with the gateway being
> the IP of the second m0n0 box on the synchronous connection.
> This works perfectly for outbound calls (and they definitely come from the
> IP range of the sync connection), but I can't get inbound calls to come in
> over the sync connection. I've defined a 1:1 NAT mapping for it to its IP
> on the sync m0n0.
> Do I perhaps need to modify the routing table on the asterisk box itself,
> and can anyone suggest what it should be modified to? I don't want to just
> change the default gateway to the second m0n0 box since all other web
> traffic (which will be to random addresses) would also be redirected over
> the VoIP ADSL, and that would be bad.
> Any suggestions gratefully appreciated.