[45270] in North American Network Operators' Group
Re: Routing through non-addressable space???
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Fri Jan 25 22:33:02 2002
Message-Id: <200201260331.g0Q3VQV4007612@foo-bar-baz.cc.vt.edu>
To: Simon Higgs <simon@higgs.com>
Cc: nanog@merit.edu
In-Reply-To: Your message of "Fri, 25 Jan 2002 18:46:55 PST."
<5.1.0.14.2.20020125184309.00a16680@higgs.com>
From: Valdis.Kletnieks@vt.edu
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Date: Fri, 25 Jan 2002 22:31:26 -0500
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On Fri, 25 Jan 2002 18:46:55 PST, Simon Higgs <simon@higgs.com> said:
> 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
Some naughty person used RFC1918 address space to number their point-to-point
links? That's OK, until they throw an ICMP error that gets tossed by a
border router that does bogon filtering. Single biggest reason why
Path MTU Discovery doesn't work, except for maybe sites that stomp on all
the ICMP traffic they see....
--
Valdis Kletnieks
Computer Systems Senior Engineer
Virginia Tech
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