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Old 05-07-2007, 05:01 AM   #1
LQ Newbie
Registered: Jan 2007
Posts: 20

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Packet Forwarding from eth0 to eth1 isn't working

Hi Folks,

I have a FC6 machine, kernel 2.6.18. I'm trying to forward packets from my eth0 interface to eth1 interface. It is not working. I have disabled the firewall as well.

Eth0 is on the network : , netmask -
Eth1 is on the network :, netmask -

I have done the following settings in my machine:

1. Turned ON the packet forwarding by setting net.ipv4.ip_forward to 1 in the /etc/sysctl.conf file.

2. Added static routes to the file static-routes in /etc/sysconfig. The contents of this file are as under:
any: host dev eth0
any: host dev eth0
any: host dev eth0
any: host dev eth0
any: host dev eth0
any: host dev eth0
any: host dev eth0
any: host dev eth0
any: host dev eth0
any: host dev eth0
any: host dev eth0
any: host dev eth0
any: host dev eth0
any: host dev eth0
any: host dev eth0
any: host dev eth0

The same configuration works on my other FC2 machine, kernel 2.6.5

Please suggest what's wrong with the FC6 machine. Is there any more setting to be done in the FC6 box?

Thanks and regards,
Old 05-07-2007, 05:24 AM   #2
LQ Guru
Registered: Aug 2001
Location: Fargo, ND
Distribution: SuSE AMD64
Posts: 15,733

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When I routed my desktop through my laptop in order to have access to my wireless router, I didn't add host routes like you are doing. However, I found out that I needed to modprobe ip_conntrack before it would work.


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