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

[Brian Blater]

Hosts are sending their packets to the default gw, which is the PIX.


On Fri, Sep 5, 2014 at 1:44 PM, Joseph Mack NA3T <jmack at wm7d.net> wrote:

> On Fri, 5 Sep 2014, Brian Blater 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?
>>
>
> do the machines you're pinging from have a route to 192.168.8.0/24 or are
> all the pings being sent to the default gw?
>
> Joe
>
>
>> Thanks,
>> Brian
>>
>>
> --
> Joseph Mack NA3T EME(B,D), FM05lw North Carolina
> jmack (at) wm7d (dot) net - azimuthal equidistant map
> generator at http://www.wm7d.net/azproj.shtml
> Homepage http://www.austintek.com/ It's GNU/Linux!
>
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