Linux not passing traffic through 1721/1841

[jscott]

I folks.  I'm hoping one of the experts around here can help me figure out what is going wrong.

I run a network that uses MPLS circuits to connect all of the companies different stores.  Internet access is through a Cisco ASA5500 here at the corp headquarters.

To make all of this work, we use a little 1721 gateway router to move traffic as needed.   All the clients in our corporate office use 10.10.99.1 (Cisco 1721) as a gateway.  The 1721 routes the traffic either to the internet (10.10.99.106 Cisco ASA5500) or the MPLS router (159.61.54.30).

For some reason, anything that runs on Linux (Ubuntu server, ReadyNAS boxes, Thecus NAS) will not pass traffic beyond the 1721 gateway router.

I've poured over the config for that router, and I can't find anything that could be causing this not to work.  Thinking that the 1721 was bad, I put an 1841 online in it's place, and it did the same thing.   I'm a noob when it comes to Cisco configs, but am learning as I go along.

Can someone help me figure out this problem?  Ive attached a txt file of the 1721 config.

Thanks.

[jscott]

Hi Alain,

Only linux hosts have trouble passing traffic through the gateway router.  All other hosts (Mac/Windows/HP Printers/Dell Printers/Wireless routers) have no problems at all.

It's very strange.

Thanks,

J.

[cadet alain]

Hi Jay,

Sorry had a lot of work.

the problem is with linux hosts only? other hosts on same subnet working?

Can post router and ASA full config(hide sensitive info) and when it fails cn you capture traffic on linux box with tcpdump

Regards.

Alain.