tracert question...two hops on the same address?

joshmadakorjoshmadakor Member Posts: 495 ■■■■□□□□□□
I was just messing around, pinging and tracing addresses in my "neighborhood" WAN when I came across this:

Tracing route to over a maximum of 30 hops

1 <1 ms <1 ms 1 ms
2 13 ms 11 ms 18 ms
3 21 ms 18 ms 19 ms
4 18 ms 17 ms 17 ms

Trace complete.

Anybody know what would cause this? I've never seen it before and I'm a newb.

++Rep for insight
WGU B.S. Information Technology (Completed January 2013)


  • RoguetadhgRoguetadhg Member Posts: 2,472
    First reply:
    No loop, #3 and #4 are the same device. It just used the same IP for
    it's source address in the ICMP TTL expired msg and the icmp echo reply
    If you research the way traceroute (in windows) works this makes sense.
    Check out:

    I've seen this with some brands of firewalls. Either both are the
    firewall or the first was the firewall, then next is an
    end device. I think that was with Checkpoint or Pix that I experienced
    that-but honestly can't remember exactly which. And of course, your
    particular config makes a world of difference.

    Source: Tracert returns same IP address two or three times
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  • joshmadakorjoshmadakor Member Posts: 495 ■■■■□□□□□□
    Thank you so much sir. That's very interesting.
    WGU B.S. Information Technology (Completed January 2013)
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