I'm trying to set up a firewall/gateway, and I can't seem to get ip forwarding to work. I'm using linux kernel 2.6.23 with iptables enabled. Here's what happens.
The firewall machine has two interfaces (both on private networks, for testing purposes): IF IP Netmask eth0 192.168.0.1 255.255.255.0 eth1 10.0.0.1 255.255.255.0 This is the routing table: Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.0.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 I enable IP forwarding, with 'echo 1 >/proc/sys/net/ipv4/ip_forward' I have the iptables_* modules loaded (* = forward,nat,mangle,raw). There are no rules in any of the tables, but all have ACCEPT as the default policy. I have two other machines, one at 192.168.0.2 (connected to the same hub as firewall's eth0) and one at 10.0.0.2 (connected via crossover to firewall's eth1). >From the firewall, I can ping both the other hosts. >From either host, I can ping the firewall at both 192.160.0.1 and 10.0.0.1. With this setup, I expect to be able to ping 10.0.0.2 from 192.168.0.2 (and vice versa), with packets routed through the firewall, but it doesn't work. What am I overlooking? I did try putting explicit iptables rules in the FILTER chain of the forward table, but it didn't make any difference. Any suggestions would be much appreciated. -- David Zelinsky -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
