Help with remote network router config

Hello people,


I need help getting hosts on my network to be able to access the
internet via the following scenario:


Network A -- Router A -- Network B --- Router B

--- internet


Routers A and B are Cisco 1841 modular routers (similar to 1700 and
2600 series).


Router A is connected to Router B via serial link (X.21)
Router B is connected to the internet via DSL WIC on dialer interface


Router A is the new router to the scenario to connect networks A and B
together.


Hosts on network A can ping hosts on Network B.
Hosts on network B can ping hosts on Network A.
Hosts on network B can access internet (they always could).
Hosts on network A CANNOT ping any address on the internet.


Router B is configured with NAT traffic to the internet and has had no
problems delivering traffic to network B.


Routers A and B are set up with RIP v1 running advertising networks A
and B.


Router A was set with an "ip route 0.0.0.0 0.0.0.0 network B" to ensure

addresses not on networks in the routing table are delivered to Router
B to pass on to the internet. I don't know if this is working as it
should.


I ran a similar setup at home with a D-link router as the gateway and a

Cisco 2514 where Router A is here and had no problems.


I tried using "debug ip packet" and "debu ip icmp" on Router B to see
what was getting through but nothing showed up when I tried to ping a
known IP on the internet.


Any help and suggestions are appreciated.


Manbo.



manbo

Thanks for your patience.

I came here to post the answer to my problem, which was a NAT issue.

Apologies for the mixup in my last post. The problem has been hosts on
Network A not being able to reach the internet (via Router B).

Router B has been working for some time and NAT was enabled on the
fastethernet port (ip nat inside) and the SHDSL interface (dialer 0 :
ip nat outside). Routers A and B were connected via serial interfaces
and what I did NOT do is enable NAT on Rotuer B's serial interface (ip
nat inside). Once I picked up on this my problem seems to have been
resolved.

Using debug ip packet detail didn't help much as I could not see
anything on Router A indicating my test host on Network A was trying to
get through to an external host address. I did manage to establish that
Router A was successfully passing requests from hosts on Network A to
Router B via a traceroute command on a host on Network B. The
traceroute would indicate something like this:

1 <1 ms <1 ms <1 ms Router A
2 1 ms 1 ms 1 ms Router B
3 * * * Request
timed out.
4 * * * Request
timed out.

So this at least directed me to the problem being with the config on
Router B rather than on Router A. After studying the configs more
closely I compared the config on the fastethernet interface of Router B
(hosting network B) with the serial interface config on Router B. My
serial interface had a very basic config and I should have spent more
time configuring it.


Thanks for looking and I hope my errors may help future network
administrators through this newsgroup.


Manbo