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Friday, November 4, 2011

Traceroute output !A * !A

We are getting this output doing a traceroute:

Router# trace 172.20.5.51

1 10.1.15.42 0 msec 0 msec 4 msec
2 172.20.10.26 !A * !A

Everything is fine.
The IP 172.20.5.51 is a loopback of the same device that has the 172.20.10.26 on a physical interface (so the packet is getting to the destination fine, connectivity is fine).

But we haven't found the meaning of the !A * !A output.

The !A indicates an "Administratively Prohibited" reply was received from the remote node, the * indicates the probe timed out.

Perhaps the node at 172.20.10.26 has an access list on the interface which denies ICMP replies in some form or another.

Please click here for document that contains a list of the Cisco traceroute replies in it.


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