ping to router interface

Unanswered Question
Apr 8th, 2008

a ping to IP Address of serial interface of the router was not successfull although a ping to next hop was successfull ???what might be the problem???????!!!!!

I have this problem too.
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mohammady Tue, 04/08/2008 - 05:44

it is E1 connection (leased line) and when i performed 'sh ip int br' i got status:up protocol:up at both routers

Kevin Dorrell Tue, 04/08/2008 - 05:47

Is the other end of the E1 owned by you, or does it belong to a service provider. If it belongs to a service provider, then it is quite likely they have inhibited ping responses to stop people probing their network topology.

Kevin Dorrell


Kevin Dorrell Tue, 04/08/2008 - 05:45

Without know more about your topology and configuration, it could be anyone's guess. It could be an access-list or other security feature in the router. It could be that the other end of the serial link does not have the address you think it has. It could be some issue related to the source address of your ping. It could be multiple paths.

Please could you proivide more detail.

Kevin Dorrell


mohammady Tue, 04/08/2008 - 05:55

yes it is owned by me...also know that the ping from the router to its interface ip was not successfull but ping to next hop was successfull.


R1 :serial0/0 ip address

R2 :serial0/0 ip address

if im login to R1 and do ping to not successfull while ping to successfull.

Richard Burts Tue, 04/08/2008 - 07:53


I may be thinking along the same lines as Kevin but I wonder if this line is configured with Frame Relay encapsulation. It is a common experience that there may be difficulty in pinging your own interface address if the interface is Frame Relay and if the IP address is configured on the physical interface. The reason for this is that you need a Frame Relay map for your own IP address to be able to ping your own address. While a Frame Relay map is usually generated automatically for the neighbor it is not generated automatically for your own address and so you need to manually configure a map for your own address.



mohammady Tue, 04/08/2008 - 08:29

the cofiguration for the E1 interface is like following:

controller E1 1/0

channel-group 0 timeslots 1-31

framing no-CRC4

Thank you for your cooperation

Richard Burts Tue, 04/08/2008 - 10:39


This is the configuration of the controller. It would be helpful if you would also post the configuration of the interface.



mohammady Tue, 04/08/2008 - 14:17

no configuration for the interface just IP address is given to it,it is a direct E1 between the two routers not a frame relay connection..

Kevin Dorrell Tue, 04/08/2008 - 20:07

Is it PPP encapsulation? If so, then you will have encapsulation ppp at your end as well. The other clue is if you have a /32 host route in your forwarding table for the other end of the link.

Kevin Dorrell


mohammady Tue, 04/08/2008 - 21:12

encapsulation is HDLC at both ends,also there is no /32 host route in the routing table

mibrahim81 Wed, 04/09/2008 - 04:55

Dear Mohammad

Could you restart the physical interface by No shut and Shut as the interface may be hanging.

If not may be access list denying ICMP packets on the router interface.

mohammady Wed, 04/09/2008 - 05:08

Thanks mibrahim81 ,it is working now after physical interface reset


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