I wouldn't make it more difficult with separate routing tables. Just set the firewall to allow traffic between the interfaces you want, drop the rest and that's it. I mean: iptables -A FORWARD -i eth0 -o eth2 -j ACCEPT iptables -A FORWARD -i eth2 -o eth0 -j ACCEPT iptables -A FORWARD -i eth1 -o eth3 -j ACCEPT iptables -A FORWARD -i eth3 -o eth1 -j ACCEPT # default policy iptables -P FORWARD DROP That should make it.... only of this router is their default gw or at least the router to the other network the hosts want to reach. On 12/7/05, Paul Lewis <paul.lewis@xxxxxxxxxxxxxxxxxxxxx> wrote: > Hi, > > The output from route -n is shown below: > > 192.168.100.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 > 192.168.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth3 > 192.168.14.0 0.0.0.0 255.255.254.0 U 0 0 0 eth4 > 192.168.4.0 0.0.0.0 255.255.252.0 U 0 0 0 eth2 > 192.168.0.0 0.0.0.0 255.255.252.0 U 0 0 0 eth1 > 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth4 > 0.0.0.0 192.168.100.254 0.0.0.0 UG 0 0 0 eth0 > > And here is the output from ifconfig (edited down to save space): > > eth0 Link encap:Ethernet HWaddr 00:14:22:09:FB:1A > inet addr:192.168.100.253 Bcast:192.168.100.255 > Mask:255.255.255.0 > inet6 addr: fe80::214:22ff:fe09:fb1a/64 Scope:Link > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > > eth1 Link encap:Ethernet HWaddr 00:04:23:BB:89:9C > inet addr:192.168.3.253 Bcast:192.168.3.255 Mask:255.255.252.0 > inet6 addr: fe80::204:23ff:febb:899c/64 Scope:Link > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > > eth2 Link encap:Ethernet HWaddr 00:04:23:BB:89:9D > inet addr:192.168.7.253 Bcast:192.168.7.255 Mask:255.255.252.0 > inet6 addr: fe80::204:23ff:febb:899d/64 Scope:Link > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > > eth3 Link encap:Ethernet HWaddr 00:14:22:09:FB:1B > inet addr:192.168.20.253 Bcast:192.168.20.255 Mask:255.255.255.0 > inet6 addr: fe80::214:22ff:fe09:fb1b/64 Scope:Link > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > > lo Link encap:Local Loopback > inet addr:127.0.0.1 Mask:255.0.0.0 > inet6 addr: ::1/128 Scope:Host > UP LOOPBACK RUNNING MTU:16436 Metric:1 > > Cheers, > > Paul > > --- > Paul Lewis (paul.lewis@xxxxxxxxxxxxxxxxx) > Part II Student > Materials Science > University of Oxford > > > > -----Original Message----- > From: Edmundo Carmona [mailto:eantoranz@xxxxxxxxx] > Sent: 07 December 2005 16:00 > To: Paul Lewis > Subject: Re: Network Routing > > to start with: what is the output of route -n or ip route show default > > On 12/7/05, Paul Lewis <paul.lewis@xxxxxxxxxxxxxxxxxxxxx> wrote: > > Hi, > > > > I have a linux router with 4 ethernet cards; eth0 through eth3. Basically, > > all I want to do is route all traffic from eth2 to eth0, and all traffic > > from eth1 to eth3. > > > > I've looked through the LARTC how-to, specifically at chapter 4, about > > multiple providers. However, I am still a bit confused, and not sure how > to > > set up my routing tables, as my scenario differs from the one in the > > example. > > > > Any help would be appreciated. > > > > Many thanks, > > > > Paul > > > > --- > > Paul Lewis (paul.lewis@xxxxxxxxxxxxxxxxx) > > Part II Student > > Materials Science > > University of Oxford > > > > > > > > > > _______________________________________________ > > LARTC mailing list > > LARTC@xxxxxxxxxxxxxxx > > http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc > > > > > _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
