I am yet to do this for myself. Bigpond permanent modem with subnet
allocated, and also a ADSL (yet to come)
I do however have an example snip of code as we set up a friends machine.
He has Optus Cable Modem and permanent Bigpond perm.
Machine has 3 pci nic's... eg; 1 nic for dhcp from optus (eth2), 1 nic for
192.168.0.1/24 priv lan (eth1), 1 nic for bigpond perm subnet (eth0)
Example;
#!/bin/sh
case $1 in
start)
# internal to internal, no route
ip rule add from 203.40.227.128/26 to 203.40.227.128/26 table main pre 100
ip rule add from 203.40.227.128/26 to 192.168.0.1/24 table main pre 100
ip rule add from 192.168.0.1/24 to 192.168.0.1/24 table main pre 100
ip rule add from 192.168.0.1/24 to 203.40.227.128/24 table main pre 100
# perm modem traffic goes back out via modem
ip rule add from 203.40.227.128/26 to 0/0 table 101 pre 101
ip route add table 101 via 139.130.37.65 dev ppp0
# and the rest goes via cable
ip rule add from 192.168.0.1/24 to 0/0 table 102 pre 101
ip route add table 102 via optusdhcpd-assigned-ip dev eth2
;;
stop)
ip rule del from 203.40.227.128/26 to 203.40.227.128/26 table main pre 100
ip rule del from 203.40.227.128/26 to 192.168.0.1/24 table main pre 100
ip rule del from 192.168.0.1/24 to 192.168.0.1/24 table main pre 100
ip rule del from 192.168.0.1/24 to 203.40.227.128/24 table main pre 100
ip rule del from 203.40.227.128/26 to 0/0 table 101 pre 101
ip route del table 101 via 139.130.37.65 dev ppp0
ip rule del from 192.168.0.1/24 to 0/0 table 102 pre 101
ip route del table 102 via optusdhcpd-assigned-ip dev eth2
;;
*)
echo "start or stop?"
;;
esac
End example
Hope this helps... cheers
> I have a cable modem and a ISDN line. I want to put two network cards in
> the one machine and have packets return on the interface they come in on.
> At the moment they return via the default route.
>
> I have not tried to get it working but my life would be a lot closer to
> complete if I could. One year I will use the floppy router project to
> create such a firewall/router.
>
> Please post how you go.
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