08-19-2003 08:20 AM - edited 03-02-2019 09:43 AM
Hello All & Greetings.
I have 3 2500 series routers properly connected and have configured the serial int with proper IP addresses. I can ping from any int on one router to any int on any other router. And, thisis true of any of the 3 routers that I have. However, I cannot ping my own serial int on my router. [so say if I have R1, R2, R3, I can ping from R1 the serial int of R2 and R3. But not the ser int of R1.]
Can someone please tell me what I am doing wrong. Thanks in advance.
kishan
08-19-2003 07:54 PM
Can you input ur configs and topology for further troubleshooting.
Give a debug ip packet (since its lab, it wont you dont need worry abt the command's impact) and see what messages you are getting. (Or a debug ip icmp).
Once the debug commands are enabled, try pinging your own interface.
Do you have access-lists on any of the routers ?
08-20-2003 07:17 AM
I will try and address the above 3 paras as 3 qs and I hope I make sense.
First, 'input ur configs ...', can you please elaborate some - meanin how and what purpose, etc.
Second, '.. debug ip packet ...' how / why etc.
Third, no, there are no access lists - standard or extended.
Finally, I was able to ping ser int on other routers!
Hope this helps. Thanks,
kishan
08-27-2003 11:43 AM
You can not ping your own interface if it´s configured as frame-relay because the router need a mapping between layer-two to layer-three for every destination.
Look at:
http://www.cisco.com/en/US/tech/tk713/tk237/technologies_q_and_a_item09186a008009457a.shtml
08-30-2003 01:29 AM
Kishan,
Check if you have enabled Unicast RPF on your interfaces. If you enable that, you wont be able to ping your own interface. Try doing a "no ip verify unicast reverse-path" on your serial interfaces.
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