This problem shows up on any cisco router that I have tried, about 20
routers. It appears from a debug packet and debug icmp on the final
destination router that the final destination router still has the port open
while it is handling the previous trace probe. I want to know if anyone can
get this to work correctly and if not where is this normal error indication
documented. Following is a trace with a probe count of 15. I have included
the debug output from the destination router.
termsvr#trace
Protocol [ip]:
Target IP address: 192.168.10.2
Source address:
Numeric display [n]:
Timeout in seconds [3]:
Probe count [3]: 15
Minimum Time to Live [1]:
Maximum Time to Live [30]:
Port Number [33434]:
Loose, Strict, Record, Timestamp, Verbose[none]:
Type escape sequence to abort.
Tracing the route to 192.168.10.2
1 192.168.10.2 16 msec * 20 msec * 20 msec * 20 msec * 20 msec * 20
msec
* 20 msec * 20 msec
termsvr#
Result of debug packet and ICMP on 192.168.10.2
01:26:14: IP: s=192.168.10.1 (Serial0), d=192.168.10.2, len 28, rcvd 0
01:26:14: ICMP: dst (192.168.10.2) port unreachable sent to 192.168.10.1
01:26:14: IP: s=192.168.10.2 (local), d=192.168.10.1 (Serial0), len 56,
sending
01:26:14: IP: s=192.168.10.1 (Serial0), d=192.168.10.2, len 28, rcvd 0
01:26:17: IP: s=192.168.10.1 (Serial0), d=192.168.10.2, len 28, rcvd 0
01:26:17: ICMP: dst (192.168.10.2) port unreachable sent to 192.168.10.1
01:26:17: IP: s=192.168.10.2 (local), d=192.168.10.1 (Serial0), len 56,
sending
01:26:17: IP: s=192.168.10.1 (Serial0), d=192.168.10.2, len 28, rcvd 0
01:26:20: IP: s=192.168.10.1 (Serial0), d=192.168.10.2, len 28, rcvd 0
01:26:20: ICMP: dst (192.168.10.2) port unreachable sent to 192.168.10.1
01:26:20: IP: s=192.168.10.2 (local), d=192.168.10.1 (Serial0), len 56,
sending
01:26:20: IP: s=192.168.10.1 (Serial0), d=192.168.10.2, len 28, rcvd 0
01:26:23: IP: s=192.168.10.1 (Serial0), d=192.168.10.2, len 28, rcvd 0
01:26:23: ICMP: dst (192.168.10.2) port unreachable sent to 192.168.10.1
01:26:23: IP: s=192.168.10.2 (local), d=192.168.10.1 (Serial0), len 56,
sending
01:26:23: IP: s=192.168.10.1 (Serial0), d=192.168.10.2, len 28, rcvd 0
01:26:26: IP: s=192.168.10.1 (Serial0), d=192.168.10.2, len 28, rcvd 0
01:26:26: ICMP: dst (192.168.10.2) port unreachable sent to 192.168.10.1
01:26:26: IP: s=192.168.10.2 (local), d=192.168.10.1 (Serial0), len 56,
sending
01:26:26: IP: s=192.168.10.1 (Serial0), d=192.168.10.2, len 28, rcvd 0
01:26:29: IP: s=192.168.10.1 (Serial0), d=192.168.10.2, len 28, rcvd 0
01:26:29: ICMP: dst (192.168.10.2) port unreachable sent to 192.168.10.1
01:26:29: IP: s=192.168.10.2 (local), d=192.168.10.1 (Serial0), len 56,
sending
01:26:29: IP: s=192.168.10.1 (Serial0), d=192.168.10.2, len 28, rcvd 0
01:26:32: IP: s=192.168.10.1 (Serial0), d=192.168.10.2, len 28, rcvd 0
01:26:32: ICMP: dst (192.168.10.2) port unreachable sent to 192.168.10.1
01:26:32: IP: s=192.168.10.2 (local), d=192.168.10.1 (Serial0), len 56,
sending
01:26:32: IP: s=192.168.10.1 (Serial0), d=192.168.10.2, len 28, rcvd 0
01:26:35: IP: s=192.168.10.1 (Serial0), d=192.168.10.2, len 28, rcvd 0
01:26:35: ICMP: dst (192.168.10.2) port unreachable sent to 192.168.10.1
01:26:35: IP: s=192.168.10.2 (local), d=192.168.10.1 (Serial0), len 56,
sending
r1#
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