Debugging problem

[superduperlopez]

Hi,

I am expereincing the following problem with a Cisco 1701, flash:c1700-advsecurityk9-mz.124-5.bin.

I telnet into the router, type the terminal monitor command and then the fun begins......

if I do a "debug ip icmp" and do a ping somewhere I get the following...

TEST#debug ip icmp
ICMP packet debugging is on
TEST#ping 66.249.93.99

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 66.249.93.99, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 44/50/56 ms
TEST#
003201: May 3 13:45:56.140 London: ICMP: echo reply rcvd, src 66.249.93.99, dst 88.66.244.33
003202: May 3 13:45:56.192 London: ICMP: echo reply rcvd, src 66.249.93.99, dst 88.66.244.33
003203: May 3 13:45:56.252 London: ICMP: echo reply rcvd, src 66.249.93.99, dst 88.66.244.33
003204: May 3 13:45:56.296 London: ICMP: echo reply rcvd, src 66.249.93.99, dst 88.66.244.33
003205: May 3 13:45:56.348 London: ICMP: echo reply rcvd, src 66.249.93.99, dst 88.66.244.33

However, if I do a "debug ip packet" and ping again.......no thing happens....

TEST#debug ip packet
IP packet debugging is on
TEST#ping 66.249.93.99

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 66.249.93.99, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 40/46/56 ms
TEST#

any ideas on why some debugging commands are working and others aren't???

Thank you

 

[leedsit]

Also, if your telnet`ing onto your router, you should also see that traffic too under the Debug Ip traffic.....

Ive always had problems with debugging on numerous routers, with inconsistant results... never have got to the bottom of it!


LEEroy
MCNE6,CCNA2,CWNA, Project+, CCSA

 

[Cluebird]

The icmp packets are being sourced from the interface closest to the destination. As such, they are not being routed across the router. If you want to see output in the debug ip packet, try using an extended ping and sourcing from another interface on the router. debug ip packet shows traffic that is crossing the router, not sourced from the router.

HTH

 

[vipergg]

Did you turn off fast switching before debugging ip packets ? You have to turn off fast switching in order for the packets to hit the processor so that you can see them . On your interfaces type " no ip route-cache " .