[141194] in North American Network Operators' Group
Re: Google and IPv6 inverse?
daemon@ATHENA.MIT.EDU (Leo Bicknell)
Mon Jun 6 10:50:42 2011
Date: Mon, 6 Jun 2011 07:49:41 -0700
From: Leo Bicknell <bicknell@ufp.org>
To: =?utf-8?B?QmrDuHJu?= Mork <bjorn@mork.no>
Mail-Followup-To: =?utf-8?B?QmrDuHJu?= Mork <bjorn@mork.no>,
nanog@nanog.org
In-Reply-To: <8762ojvxct.fsf@nemi.mork.no>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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In a message written on Mon, Jun 06, 2011 at 04:38:26PM +0200, Bj=C3=B8rn M=
ork wrote:
> You can convince your traceroute to do that for you:
>=20
> -A --as-path-lookups Perform AS path lookups in routing registri=
es and
> print results directly after the correspond=
ing
> addresses
I have not had good luck with that feature.
Here's a FreeBSD traceroute, using the same host I referenced before:
% traceroute -a efes.iucc.ac.il
traceroute to efes.iucc.ac.il (128.139.202.17), 64 hops max, 52 byte packets
1 [AS1280] exit.blue.sql1.isc.org (149.20.48.1) 4.658 ms 2.718 ms 1.778=
ms
2 [AS1280] int-0-4-0-0.r1.pao1.isc.org (149.20.65.9) 3.656 ms 2.363 ms =
0.944 ms
3 [AS1221] ge-9-15-1G.ar1.PAO2.gblx.net (64.215.195.21) 50.539 ms 50.508=
ms 59.709 ms
4 [AS3549] DANTE.TenGigabitEthernet7-3.ar1.FRA4.gblx.net (207.138.144.46)=
166.476 ms 166.240 ms 166.243 ms
5 [AS20965] iucc-lb1-gw.rt1.fra.de.geant2.net (62.40.125.122) 230.590 ms=
230.587 ms 230.545 ms
6 [AS378] gp1-gp0-te.ilan.net.il (128.139.188.1) 230.546 ms 230.579 ms =
230.528 ms
7 * * *
Now, I happen to administer hop #2, and know the packets are leaving
on a link to Global Crossing (glbx.net). How AS 1221, which is
Telstra, ends up in there is beyond me.
=46rom a Juniper box with a full table:
bicknell@re0.r7.pao1> traceroute as-number-lookup efes.iucc.ac.il=20
traceroute to efes.iucc.ac.il (128.139.202.17), 30 hops max, 40 byte packets
1 int-2-0-0.r1.pao1.isc.org (149.20.65.16) 4.448 ms 3.973 ms 3.222 ms
2 ge-9-15-1G.ar1.PAO2.gblx.net (64.215.195.21) 50.724 ms 67.135 ms 50.7=
61 ms
3 DANTE.TenGigabitEthernet7-3.ar1.FRA4.gblx.net (207.138.144.46) [AS 3549=
] 159.652 ms 159.571 ms 160.003 ms
4 iucc-lb1-gw.rt1.fra.de.geant2.net (62.40.125.122) [AS 20965] 279.761 m=
s 275.059 ms 230.929 ms
5 gp1-gp0-te.ilan.net.il (128.139.188.1) [AS 378] 231.149 ms 231.222 ms=
231.258 ms
6 * * *
At least it's not wrong, but there is no ASN listed because the /30
on the link between 2 and 3 is internal, so it views hop 3 as being
internal to my ASN, when it is not.
But more importantly, not all traceroutes have this feature, and as I
said it's about being polite.
--=20
Leo Bicknell - bicknell@ufp.org - CCIE 3440
PGP keys at http://www.ufp.org/~bicknell/
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