Traceroute over Tunnel

From: gladston@br.ibm.com
Date: Wed Jul 27 2005 - 16:24:25 GMT-3

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Hi,

Have you seem this behavior?

When traceroute goes over a tunnel, the result is slight different.

R2---------R6----R4
|__tunnel__|

Type escape sequence to abort.
Tracing the route to 148.5.4.1

  1 148.5.46.4 4 msec * 4 msec
Rack2R2#

There is no result from R6.

Here is what debug shows:

.Feb 28 23:42:57: ICMP: dst (148.5.226.2) port unreachable rcv from 148.5.46.4

This is what occurs without tunnel:

R2----R5-----R3

Rack2R2#trace 148.5.3.1

Type escape sequence to abort.
Tracing the route to 148.5.3.1

  1 148.5.235.5 4 msec 4 msec 4 msec
  2 148.5.235.3 8 msec * 4 msec

.Feb 28 23:41:50: ICMP: time exceeded rcvd from 148.5.235.5
.Feb 28 23:41:50: ICMP: dst (148.5.235.2) port unreachable rcv from 148.5.235.3 * 4 msec

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