Hi. Could somebody point me in the right direction on a ip forwarding
problem that I've got despite endless trawling through FAQ's.
I have this setup with Redhat 7.1:
----
|INET|
----
|
|*public_ip_address
-----------
|ADSL Router|
-----------
|* 192.168.5.10
|
|*[eth0]192.168.5.1
-----------
| | |---|
| Linux |------------------------|DMZ|
| iptables | *[eth2]192.168.2.1 |---|
| |
-----------
|*[eth1]192.168.1.1
|
|
---
|LAN|
---
What I want, to start with, is for all outgoing traffic on lan to be
forwarded to external internet connection.
What I've done is added on firewall
route add default gw 192.168.5.10
and run the following script
#/bin/sh
echo 1 > /proc/sys/net/ipv4/ip_forward
/sbin/iptables --flush
/sbin/iptables --table nat --flush
/sbin/iptables --delete-chain
/sbin/iptables --table nat --delete-chain
/sbin/iptables --append FORWARD --in-interface eth0 -j ACCEPT
/sbin/iptables --append FORWARD --in-interface eth1 -j ACCEPT
/sbin/iptables --append FORWARD --in-interface eth2 -j ACCEPT
After this I can ping from firewall to internet and to 192.168.1.* subnet.
However on 192.168.1.* subnet I can ping 192.168.1.1, 192.168.5.1 but not
192.168.5.10 and not any external addresses.
I would be grateful for any advice on troubleshooting this.
Thanks.
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