[144906] in North American Network Operators' Group
Re: wet-behind-the-ears whippersnapper seeking advice on building a
daemon@ATHENA.MIT.EDU (Owen DeLong)
Tue Sep 20 18:33:40 2011
From: Owen DeLong <owen@delong.com>
In-Reply-To: <Pine.LNX.4.61.1109201539070.25015@soloth.lewis.org>
Date: Tue, 20 Sep 2011 15:26:33 -0700
To: Jon Lewis <jlewis@lewis.org>
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Sep 20, 2011, at 2:02 PM, Jon Lewis wrote:
> On Tue, 20 Sep 2011, Chris Adams wrote:
>=20
>> Devil's advocate: if you have links to two carriers, but they are
>> delivered via the same LEC on the same fiber, are you multihomed? =
What
>> about if you have two LECs at your facility, but the two circuits =
share
>> a common path elsewhere (outside of your knowledge)?
>=20
> I'd say you are. End users frequently don't know the layout of their =
carrier's networks, and I certainly wouldn't expect ARIN to be =
interested in that level of detail.
>=20
> What's next? Are you going to ask if I'd require that your router =
have dual power supplies from different UPS's, or that if they don't =
have dual power, you have a router per transit connection?
>=20
> It's a shame ARIN's auditors don't hang out here (or if they do, that =
they don't jump in and end these sorts of "what if" circle-jerks). It's =
a simple enough question...have they already seen applications for =
IP/ASN resources where the applicant was required to be multihomed and =
their connectivity was one leased line and a GRE tunnel with BGP to a =
second provider. Was the request approved?
>=20
> How many providers will even provision such a service?
>=20
I know for a fact that ARIN has received and approved such requests.
I do not know whether ARIN was aware of the exact details of the =
underlying topology in question at the time they approved the request or =
not.
I was a consultant filling out the applications for my clients at the =
time. It wasn't quite exactly what you describe, it was 2 GRE tunnels to =
different providers over a tail circuit from a third provider.
As long as you can show transit and/or peering with two ASNs (usually =
through a peering contract or letter of intent from the peer/transit =
provider), ARIN considers you to be multihomed for policy purposes. The =
underlying physical or logical mechanisms by which you reach those two =
(or more) neighbor ASNs are not ARIN's concern.
Owen
