[Dshield] Odd traceroute, I *think* I know what's going on, but not sure.

John Hardin jhardin at impsec.org
Wed Oct 8 18:27:19 GMT 2008


On Wed, 8 Oct 2008, Brenden Walker wrote:

> Seems that the Vista version does, or perhaps has something to do with our domain setup here:
>
> C:\Users\bkwalker>tracert 123.30.74.2
>
> Tracing route to bkwalkerpc.drbsystems.com [123.30.74.2]
> over a maximum of 30 hops:
>
>  1    <1 ms    <1 ms    <1 ms  10.168.0.1
>  2     1 ms    <1 ms    <1 ms  12.196.88.129
>  3     9 ms     8 ms    10 ms  12.116.78.129
>  4    17 ms    16 ms    16 ms  cr81.dtrmi.ip.att.net [12.122.102.26]
>  5    16 ms    16 ms    16 ms  cr1.cgcil.ip.att.net [12.123.139.157]
>  6    17 ms    17 ms    16 ms  tbr1.cgcil.ip.att.net [12.122.17.154]
>  7    15 ms    15 ms    15 ms  ggr3.cgcil.ip.att.net [12.123.4.245]
>  8    39 ms    41 ms    32 ms  192.205.35.178
>  9   522 ms   651 ms   474 ms  62.154.15.166
> 10   682 ms   656 ms   625 ms  217.239.40.57
> 11   590 ms   597 ms   495 ms  62.154.14.97
> 12   685 ms   675 ms   636 ms  217.239.37.173
> 13   691 ms   768 ms   679 ms  212.184.27.158
> 14   649 ms   651 ms   646 ms  bkwalkerpc.drbsystems.com [123.30.120.13]
> 15   652 ms   653 ms   695 ms  bkwalkerpc.drbsystems.com [123.30.120.46]
> 16   648 ms   641 ms   637 ms  bkwalkerpc.drbsystems.com [123.30.74.2]
>
> Trace complete.
>
> ;-)

Confirmed on Vista, from a host on the same network as the earlier 
example. It's probably not your network setup unless ours is misconfigured 
the same way.

"ping -a" does the same thing.

Some quick googles don't seem to show anybody else discussing this issue.

Why in the world would anybody think it was reasonable to do that?

I wonder if this could be used to bypass security somehow? "Oh, the host 
I got that content from is me ('localhost' mapped to my local hostname), 
so I can trust it..."

--
  John Hardin KA7OHZ                    http://www.impsec.org/~jhardin/
  jhardin at impsec.org    FALaholic #11174     pgpk -a jhardin at impsec.org
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