Two NIC Routing Question
Jake Colman
colman at ppllc.com
Wed Jun 1 13:31:58 UTC 2005
I have a class two NIC firewall. eth0 is my external interface connected to
my cablemodem, eth1 is my internal interface connected to my hub. I am using
iptables-based firewall rules and using NAT so I can access the internet from
all my desktops. Everything is working correctly.
The problem is that it only works if I manually set up a default gateway
route through the external interface. After I boot the system, I type the
following command:
route add default gw x.x.x.x
where x.x.x.x is the address assigned to my external interface. If I don't do
this, I cannot access anything on the internet from any my internal machines.
Once I execute this command it all works as expected. I am certain, however,
that as a RH 7.2 system, which is what I was before I started incrementally
upgrading to FC1 where I am now, I did not need to do this for it to work.
How can I get this routing between two NICs to work correctly without
manually executing a 'route' command? Please don't tell me to add this
command to rc.local. My external IP address is dynamic so it can change
between reboots. I need some mechanism that works dynamically. I'm sure
that it used to work this way!
TIA!
...Jake
--
Jake Colman
Sr. Applications Developer
Principia Partners LLC
Harborside Financial Center
1001 Plaza Two
Jersey City, NJ 07311
(201) 209-2467
www.principiapartners.com
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