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RE: Routing through non-addressable space???

  • From: Simon Higgs
  • Date: Sat Jan 26 04:07:27 2002


At 09:35 PM 1/25/02 -0600, you wrote:

Mmmmmm... this trace is from an @Work/Excite circuit that is about to go dark. The "cable modem" is (as far as I can tell) the Cisco 2600 at the customer site. Either that or @Work's customer gateway address.

Cable modems actually "have" two IP's: one rfc1918 that they use for
provisioning purposes and in the actual IP of the cable modem device,
one real IP that they pass on to the end-user's device.  Many of the
newer cable modems are now showing the private IP in traces where
previously they'd pass and not respond to ICMP.  As for why, who knows?
My best guess is to ease tracking down offending IP's vs. users.

Michael Graham

-----Original Message-----
From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of
Turpin, Mark
Sent: Friday, January 25, 2002 8:43 PM
To: 'Simon Higgs'; 'nanog@merit.edu'
Subject: RE: Routing through non-addressable space???


Routing through a cable interface that has a 10.x address as its primary
ip
address would be my first guess, esp. due to the 24.x address.

!
int cable3/0
ip address 10.x.x.x. x.x.x.x.x
ip address public.for.cpe.equip mask.mask.mask.mask secondary

cheers,

Mark Turpin
Charter NOC
mturpin@chartercom.com

-----Original Message-----
From: Simon Higgs [mailto:simon@higgs.com]
Sent: Friday, January 25, 2002 8:47 PM
To: nanog@merit.edu
Subject: Routing through non-addressable space???


Can someone explain this trace to me. How on earth did the 10.0.0.0
network
get inserted into the last hop?

#    IP address       Host name                                Round
trip
time

4    24.130.2.243     GSR1-SRP4-0.lsanhe4.we.mediaone.net 64 ms
5    24.130.2.242     GSR2-SRP4-0.lsanhe3.we.mediaone.net 71 ms
6    12.125.98.13     Unavailable                         79 ms
7    12.123.28.94     gbr2-p100.la2ca.ip.att.net          94 ms
8                     No response
9    12.122.11.226    ggr1-p340.la2ca.ip.att.net          110 ms
10   192.205.32.246   att-gw.la.home.net                  112 ms
11   24.7.74.182      wbb1-pos2-0.pop1.ca.home.net        120 ms
12   10.252.25.118    Unavailable                         134 ms
13   209.125.128.80   Unavailable                         141 ms

Best Regards,

Simon

--
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