ICMP type:3, code:3, Destination port unreachable

Hi guys,

I have built a network on GNS3 and have simulated PC using VPCS (
http://www.freecode.com.cn/doku.php?id=wiki:vpcs).

While doing a traceroute I have got the following output:

VPCS[2]> tracert 23.23.23.1
traceroute to 23.23.23.1, 64 hops max, press Ctrl+C to stop
 1 10.177.160.2 63.000 ms 47.000 ms 46.000 ms
 2 10.177.162.9 218.000 ms 94.000 ms 78.000 ms
 3 10.177.162.2 171.000 ms 125.000 ms 110.000 ms
 4 62.190.99.1 156.000 ms 156.000 ms 156.000 ms
 5 *144.123.20.9 265.000 ms (ICMP type:3, code:3, Destination port
unreachable)

The trace is correct and the IP address (23.23.23.1/24) is in fact a
loopback on the same router which is on hop 5.

I am trying to understand as to why I am getting "Destination port
unreachable" and how can it be fixed

Regards,
Malik

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Received on Mon Mar 28 2011 - 03:00:47 ART