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New Member

Newbie routing question on 1841

Hi all,

I believe I am having a routing issue on a 1841 router.

The connection is like this (IPs changed):

ISP router (



1841 Serial (


1841 FE0/0 (

I can ping and trace to the internet from the serial interface but not the FE0/0 interface (or the FE0/1 which was setup just to see if there was an issue with the other interface).

I am using a static route:

ip route Serial0/0/0

It just isn't working.

Any ideas on what I am missing? I expect it is something basic, but I am not sure what.

Another thing is that when doing a show ip route, I get:

Gateway of last resort is to network

Any help would be greatly appreciated.



Hall of Fame Super Gold

Re: Newbie routing question on 1841


you are missing NAT.

I suggest you quit with the SDM now and do manual configuration that will permit you to learn how things work:

interface serial

ip nat outside

interface ethernet

ip nat inside

ip nat inside source list 101 interface serial overload

access-list 101 permit ip 192.168.x.0

replace x with whatever network you will be using.

hope this helps, please rate post if it does!

New Member

Re: Newbie routing question on 1841

Thanks! That solve the problem.