[45274] in North American Network Operators' Group
RE: Routing through non-addressable space???
daemon@ATHENA.MIT.EDU (Simon Higgs)
Sat Jan 26 04:05:43 2002
Message-Id: <5.1.0.14.2.20020126005938.034f38a0@oak.higgs.net>
Date: Sat, 26 Jan 2002 01:04:39 -0800
To: "Michael Graham" <jmgraham@midsouth.rr.com>
From: Simon Higgs <simon@higgs.com>
Cc: nanog@merit.edu
In-Reply-To: <000001c1a61a$80d6b600$65de12ac@funder.dnsalias.net>
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Errors-To: owner-nanog-outgoing@merit.edu
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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