[TriLUG] Linux Routing - why isn't it working?

[Matt Flyer]

Do you have more than one default gateway assigned?  That will create which way to go confusion and traffic goes nowhere even with a metric value.

Sent from my iPad

> On Sep 5, 2014, at 1:12 PM, Brian Blater <brb.lists at gmail.com> wrote:
> 
> Hi all,
> 
> I know this has got to be something simple, but I just can't figure out
> what is wrong.
> 
> I have an Ubuntu 12.04 server that has two nics. Eth0 connects to the main
> network and Eth1 connects to a small/private network. Eth0 is on the inside
> network of a PIX 515e and has internet access. Here's a simple pic:
> 
> internet --- PIX --- (192.168.9.0/24) --- Ubuntu --- (192.168.8.0/24)
> 
> The PIX is the default gateway for ubuntu eth0 as well as all the host on
> the .9 network. I have added a route on the PIX to send traffic from the .9
> network to the IP of the ubuntu box. From the PIX I can ping eth1 of the
> ubuntu box, but not a device on that .8 network.
> 
> I've enable routing on the ubuntu box (ip_forward is set to 1).
> 
> No other boxes on the .9 network can even ping eth1 on the ubuntu box.
> 
> What in the world am I missing here? I've done several google searches and
> all of them point to enabling ip_forward and make sure iptables is not
> blocking anything. IP tables is currently off on the ubuntu box.
> 
> Anyone have any ideas?
> 
> Thanks,
> Brian
> -- 
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