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What does it mean when traceroute continues after its destination?

For example; if I was trying to traceroute 4.4.4.4 why would something like the following occur:

13  x.x.x.x (xxxx)  26.966 ms  29.600 ms  44.526 ms
14  4.4.4.4 (xxxx)  29.274 ms  28.462 ms  28.840 ms
15  * * *
16  * * *
17  * *
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I think this may be of help to my question: groups.google.com/forum/?fromgroups=#!topic/comp.unix.solaris/… –  josten Mar 6 '13 at 21:58
1  
Try both ICMP and UDP traceroutes. In my experience one of the two types of traceroute works properly in most cases. –  Saurabh Barjatiya Mar 7 '13 at 3:44

1 Answer 1

up vote 3 down vote accepted

4.4.4.4 is not returning the correct response to show the destination has been reached. Traceroute relies on this reply (ICMP Port Unreachable according to the link you provided - I remember it from working with traceroute but can't remember the precise signal name).

Traceroute itself doesn't just check for a response that comes from the destination, just the type of response received to check if it has reached the destination.

So I would guess that ICMP on 4.4.4.4 is a problem, either through a Firewall blocking issue or some sort of port-forwarding configuration.

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