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Traceroute returning same destination multiple times

Posted on 2006-10-28
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Last Modified: 2008-08-14
Trying to get some clarification, I've tried other sources but no real answer. I'm performing a traceroute to a device with a NAT'd address that is connected via VPN Tunnel, for each device that is hidden, I am recieving the destination IP. Is this normal behaviour or is there something wrong. Could this affect performance between the two devices?

Tracing route to 192.168.63.36 over a maximum of 30 hops

  1     6 ms     6 ms     6 ms  10.199.1.101
  2     7 ms     8 ms     7 ms  10.199.1.2
  3     8 ms     7 ms     7 ms  10.219.12.1
  4    14 ms    11 ms    11 ms  10.219.13.1
  5    15 ms    10 ms    11 ms  192.168.63.36
  6    12 ms    11 ms    11 ms  192.168.63.36
  7    11 ms    10 ms    11 ms  192.168.63.36
  8    12 ms    11 ms    11 ms  192.168.63.36
  9   144 ms    12 ms    11 ms  192.168.63.36
 10    13 ms    11 ms    11 ms  192.168.63.36
 11    12 ms    11 ms    12 ms  192.168.63.36

Trace complete.
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Question by:cfbros
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by:lrmoore
ID: 17826296
How many hops to you expect to see? If going through a VPN tunnel, I would not expect to see more than 2.
It appears to be a routing loop, but I would not expect to see the actual destination IP as the responder if it was..
Can you explain your topology a little more? Perhaps a little ascii drawing?
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by:cfbros
ID: 17826370
The number of hops is correct, it is the destination response that i am concerned about. Also, after the 10.219.12.1 response, the rest is on the recipients end and I do not know what the topology is. They claim that this is what I'm suppose to be seeing but I have concerns when I see the destination address responding for each device.
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by:The--Captain
ID: 17826536
Umm, why can't it just be as simple as "They are NATting their replies to you so you specifically don't see any of their topology"?

What exactly is the problem (what does not work)?

Cheers,
-Jon
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by:giltjr
ID: 17826609
The--Captain hit the nail on the head.  The 5th hop is the 1st point within the 'real' network and they are replacing the source IP addresss on the ICMP (ping) messages so that you can't map out the internal network.
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by:cfbros
ID: 17826719
That I understand, but the question that I'm asking is, should the devices all respond with the NAT'd address?
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The--Captain earned 500 total points
ID: 17827327
>should the devices all respond with the NAT'd address?

No.  Assuming this is what's going on, the NAT box lies to you when it sees IPs that match the NAT rules - that's the whole point.

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