RE: Routing through non-addressable space???

[Simon Higgs]

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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