unable to self-ping

[kelvin-yeo]

Hi Guys,

i have just setup 2 routers point-to-point with DB60 back-to-back cable.

Routers is configured with only ip addresses.

RouterA is able to self-ping and the next-hop(RouterB).

RouterB is only able to ping to next-hop (RouterA) BUT not self-ping.

Any Explaination out there?

Cheers,

kelvin

[Georg Pauwen]

Hello Kelvin,

which encapsulation do you use on the serial interfaces ? Can you post your configs ?

Regards,

GP

[kelvin-yeo]

Hi GP,

Two routers are fresh out of the box.

Only config is the ip addr on the serial interface

cheers,

kelvin

[Richard Burts]

Is it possible that the subnet mask used on the two routers do not match? This could produce a situation where one router believes the other router is in a connected subnet but the other router thinks the subnet is much smaller and does not include the first router.

for example

rtrA

ip address 192.168.1.1 255.255.255.0

rtrB

ip address 192.168.1.5 255.255.255.252

This would produce exactly the symptoms that you describe. rtrA recognizes that rtrB is on a connected subnet and can forward to it, while rtrB does not recognize the address of rtrA as a connected subnet and could not forward to it.

It would clarify the situation if you would post the config of both routers - even if there is not much to it.

HTH

Rick

[cool.cisco]

HI Kelvin,

AS i understand, you need to have L2 protocol defined, because if you only use layer 3 protocol then you will not be able to ping it..

M i right guys pls correct me if i am wrong.

If you are using Frame relay then you have to map remote ip with local dlci and local ip with remote dlci...

Hope this will help..