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Tracert / FQDN question...

post #1 of 2
11/9/12 at 1:55pm
Thread Starter 
If a tracert command returns


8 ss-escdl-3-4.srpintlink.net (161.81.97.24) 71 ms 64 ms 58 ms

(example line)

Question.

1. Where did the computer running traceroute get the name (FQDN) from?

I have narrowed it down to either being the server itself during the Tracert response or the local computer querying the DNS server for srpintlink.net to get it, any help please?

EDIT: It HAS to be the DNS server for a FQDN if I am not mistaken.
Edited by ikillerzi - 11/9/12 at 1:59pm
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post #2 of 2
11/9/12 at 2:25pm
Not a dns server, its one of the servers the trace hops through to get to the server you traced, it's the rDNS lookup for the IP in parentheses.

Example, I'll tracert overclock.net:

Copyright (c) 2009 Microsoft Corporation. All rights reserved.
Code:
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\Zach Fedora>tracert overclock.net

Tracing route to overclock.net [174.36.23.242]
over a maximum of 30 hops:

  1     1 ms    <1 ms     1 ms  10.0.0.2
  2     4 ms     2 ms     1 ms  10.0.0.1
  3    39 ms    28 ms    29 ms  96.120.25.157
  4    23 ms    43 ms    24 ms  te-2-1-ur03.griffith.in.chicago.comcast.net [68.
86.119.157]
  5    48 ms    18 ms    19 ms  te-8-2-ur04.griffith.in.chicago.comcast.net [68.
87.211.86]
  6    56 ms    13 ms    15 ms  te-0-4-0-2-ar01.area4.il.chicago.comcast.net [68
.87.211.81]
  7    14 ms    22 ms    22 ms  68.86.90.49
  8    13 ms    14 ms    11 ms  pos-1-3-0-0-pe01.350ecermak.il.ibone.comcast.net
 [68.86.86.158]
  9    63 ms    12 ms    13 ms  xe-0-0-0.bbr01.eq01.chi01.networklayer.com [75.1
49.228.98]
 10    45 ms    46 ms    45 ms  ae20.bbr01.eq01.dal03.networklayer.com [173.192.
18.136]
 11    57 ms    49 ms    58 ms  ae0.dar02.sr01.dal01.networklayer.com [173.192.1
8.253]
 12    45 ms    47 ms    50 ms  po2.fcr04.sr05.dal01.networklayer.com [66.228.11
8.218]
 13    45 ms    50 ms    44 ms  174.36.23.242-static.reverse.softlayer.com [174.
36.23.242]

Trace complete.

C:\Users\Zach Fedora>

It makes sense, first hop (for me) is my wireless ap, second is router, third is Comcast's nearest PoP to me, fourth is the "distribution center" where the packets are sent out to the requested server, and so on.

Sure, a DNS server handles the rDNS records, but the reverse zone is for the whole network that uses that DNS server, if that makes any sense. smile.gif
Edited by ZFedora - 11/9/12 at 2:45pm
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