From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1Rypa9-0000ah-5Y for garchives@archives.gentoo.org; Sat, 18 Feb 2012 19:04:33 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 5E8C9E0E3A; Sat, 18 Feb 2012 19:04:15 +0000 (UTC) Received: from svr-us4.tirtonadi.com (svr-us4.tirtonadi.com [69.65.43.212]) by pigeon.gentoo.org (Postfix) with ESMTP id 4C725E0EAA for ; Sat, 18 Feb 2012 19:02:57 +0000 (UTC) Received: from mail-lpp01m010-f53.google.com ([209.85.215.53]) by svr-us4.tirtonadi.com with esmtpsa (TLSv1:RC4-SHA:128) (Exim 4.69) (envelope-from ) id 1RypYh-000ACz-EV for gentoo-user@lists.gentoo.org; Sun, 19 Feb 2012 02:02:59 +0700 Received: by lahd3 with SMTP id d3so5641166lah.40 for ; Sat, 18 Feb 2012 11:02:52 -0800 (PST) Received-SPF: pass (google.com: domain of pandu@poluan.info designates 10.112.84.233 as permitted sender) client-ip=10.112.84.233; Authentication-Results: mr.google.com; spf=pass (google.com: domain of pandu@poluan.info designates 10.112.84.233 as permitted sender) smtp.mail=pandu@poluan.info Received: from mr.google.com ([10.112.84.233]) by 10.112.84.233 with SMTP id c9mr3970481lbz.1.1329591772076 (num_hops = 1); Sat, 18 Feb 2012 11:02:52 -0800 (PST) Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Received: by 10.112.84.233 with SMTP id c9mr3316747lbz.1.1329591772049; Sat, 18 Feb 2012 11:02:52 -0800 (PST) Received: by 10.112.38.194 with HTTP; Sat, 18 Feb 2012 11:02:51 -0800 (PST) Received: by 10.112.38.194 with HTTP; Sat, 18 Feb 2012 11:02:51 -0800 (PST) In-Reply-To: References: <4F3F7CBA.9020600@gmail.com> <20120218124409.43286f16@khamul.example.com> <4F3F92C0.3060506@gmail.com> <1971113.3a2zZ3o5ps@localhost> <4F3F9BFF.9070104@gmail.com> <20120218164058.65c82d3d@khamul.example.com> <4F3FC50B.3010001@gmail.com> Date: Sun, 19 Feb 2012 02:02:51 +0700 Message-ID: Subject: Re: [gentoo-user] Somewhat OT: Any truth to this mess? From: Pandu Poluan To: gentoo-user@lists.gentoo.org Content-Type: multipart/alternative; boundary=f46d04016aff44f08e04b941b574 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - svr-us4.tirtonadi.com X-AntiAbuse: Original Domain - lists.gentoo.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - poluan.info X-Archives-Salt: 06fdfcfd-a3eb-44b7-9632-5ff70f0e7d37 X-Archives-Hash: 231d3f0e6224bbdb01359159442e30d0 --f46d04016aff44f08e04b941b574 Content-Type: text/plain; charset=UTF-8 On Feb 19, 2012 1:15 AM, "Michael Mol" wrote: > > (Sorry for the top-post...I'm mobile atm.) > > My understanding is that core network operators filter ASs for which they don't have a contract for transit. I.e, if I were to get my own PI space, I'd have to pay tier 1 networks (or pay someone to ride on *their* contract) for a contract to have packets destined for my AS to be able to reach me across their network. > Well, yes, but it's the other way around. It's an operator saying "I don't want traffic for $AS_LIST" or "I want traffic only for $AS_LIST". The contents of AS_LIST is set by the operator on the receiving side statically, based on the transit contract. The routers, being the workhorse brutes that they are, don't waste time checking on contracts. So, if a neighbor router suddenly advertise it has a 1-hop distance to *any* AS... the router will immediately begin switching packets toward that neighbor. Rgds, --f46d04016aff44f08e04b941b574 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable


On Feb 19, 2012 1:15 AM, "Michael Mol" <mikemol@gmail.com> wrote:
>
> (Sorry for the top-post...I'm mobile atm.)
>
> My understanding is that core network operators filter ASs for which t= hey don't have a contract for transit. I.e, if I were to get my own PI = space, I'd have to pay tier 1 networks (or pay someone to ride on *thei= r* contract) for a contract to have packets destined for my AS to be able t= o reach me across their network.
>

Well, yes, but it's the other way around.

It's an operator saying "I don't want traffic for $AS_LIST&= quot; or "I want traffic only for $AS_LIST". The contents of AS_L= IST is set by the operator on the receiving side statically, based on the t= ransit contract.

The routers, being the workhorse brutes that they are, don't waste t= ime checking on contracts.

So, if a neighbor router suddenly advertise it has a 1-hop distance to *= any* AS... the router will immediately begin switching packets toward that = neighbor.

Rgds,

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