[lug] network card problem

[John Karns]

On Mon, 20 May 2002, Brett Monson said:

> I have two 3-com network cards. Eth1 can interface to the network here
> at work and access the internet. Eth0 (IP:10.10.10.10) can ping a
> linux workstation (10.10.10.11) and vice versa that are connected via
> a null modem cable. I cannot however ping or get on the internet via
> the 10.10.10.11 workstation. When I installed RedHat 7.2 I used the no
> firewall option. Also, I have installed iptable updates as required to
> use Shorewall. Whether shorewall is on or off, there seems to be no
> transfer of packets from eth0 to eth1. Is there some kind of
> configuration option or code that needs to be implimented to make
> these cards transfer packets between them with no firewall present?

Without knowing anything about the .11 ws machine that you're trying to
use as a gateway and not being a RH user myself, I would guess that you
need to set up masquerading on the ws and enable port forwarding:

echo "1" > /proc/sys/net/ipv4/ip_forward

unless it's already set up that way.

----------------------------------------------------------------
John Karns                                        jkarns at csd.net