[162184] in North American Network Operators' Group
Re: route for linx.net in Level3?
daemon@ATHENA.MIT.EDU (Tom Paseka)
Thu Apr 4 18:11:34 2013
In-Reply-To: <m2k3oido1r.wl%randy@psg.com>
Date: Thu, 4 Apr 2013 15:11:24 -0700
From: Tom Paseka <tom@cloudflare.com>
To: Randy Bush <randy@psg.com>
Cc: NANOG list <nanog@nanog.org>, Brian Dickson <brian.peter.dickson@gmail.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Thu, Apr 4, 2013 at 1:43 PM, Randy Bush <randy@psg.com> wrote:
>>> Even if the exchange does not advertise the exchange LAN, it's
>>> probably the case that it is in the IGP (or at least IBGP) of
>>> everyone connected to it,
>
> yikes! this is quite ill-advised and i don't know anyone who does
> this, but i think all my competitors should.
>
Its more common than uncommon.
At WIX (Wellington), 64 out of 93 members will carry packets destined
to APE (Auckland Exchange). (source:
http://conference.apnic.net/__data/assets/pdf_file/0018/50706/apnic34-mike-jager-securing-ixp-connectivity_1346119861.pdf)
and this is just New Zealand!
Just checked a few exchanges, not just are the IXP ranges being
carried, they're being leaked:
Equinix SG:
$ bgpctl show rib 202.79.197.0/24
flags: * = Valid, > = Selected, I = via IBGP, A = Announced
origin: i = IGP, e = EGP, ? = Incomplete
flags destination gateway lpref med aspath origin
202.79.197.0/24 100 0 13335 23947 23947 ?
202.79.197.0/24 100 0 13335 10026 i
Any2 LA:
bgpctl show rib 206.223.143.0/24
flags: * = Valid, > = Selected, I = via IBGP, A = Announced
origin: i = IGP, e = EGP, ? = Incomplete
flags destination gateway lpref med aspath origin
206.223.143.0/24 100 0 13335 9304 i
206.223.143.0/24 100 0 13335 9304 i
206.223.143.0/24 100 0 13335 4635 9304 i
206.223.143.0/24 100 0 13335 9304 i
>> I have experience of several networks where that is not the case. IGP
>> carries routes for loopback and internal-facing interfaces;
>
> i have seen some carry external because, for some reason, they do not
> want to re-write next-hop at the border.
>
> randy
>
