Re: [BEHAVE] [v6ops] Home NAPT44 - How many ports?

Mikael Abrahamsson <swmike@swm.pp.se> Mon, 17 June 2013 05:28 UTC

Return-Path: <swmike@swm.pp.se>
X-Original-To: behave@ietfa.amsl.com
Delivered-To: behave@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 04B5021F99D0; Sun, 16 Jun 2013 22:28:55 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.555
X-Spam-Level:
X-Spam-Status: No, score=-1.555 tagged_above=-999 required=5 tests=[AWL=1.044, BAYES_00=-2.599]
Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lVNCx2fq6BTI; Sun, 16 Jun 2013 22:28:54 -0700 (PDT)
Received: from uplift.swm.pp.se (ipv6.swm.pp.se [IPv6:2a00:801::f]) by ietfa.amsl.com (Postfix) with ESMTP id 501AD21F89EB; Sun, 16 Jun 2013 22:28:54 -0700 (PDT)
Received: by uplift.swm.pp.se (Postfix, from userid 501) id 9E0F99C; Mon, 17 Jun 2013 07:28:53 +0200 (CEST)
Received: from localhost (localhost [127.0.0.1]) by uplift.swm.pp.se (Postfix) with ESMTP id 95E779A; Mon, 17 Jun 2013 07:28:53 +0200 (CEST)
Date: Mon, 17 Jun 2013 07:28:53 +0200 (CEST)
From: Mikael Abrahamsson <swmike@swm.pp.se>
To: "Softwires-wg list (softwires@ietf.org)" <softwires@ietf.org>
In-Reply-To: <FC155739-3CB3-48FD-B77A-8526BEE9648B@cisco.com>
Message-ID: <alpine.DEB.2.00.1306170719170.19912@uplift.swm.pp.se>
References: <B14A62A57AB87D45BB6DD7D9D2B78F0B116D2400@xmb-rcd-x06.cisco.com> <FC155739-3CB3-48FD-B77A-8526BEE9648B@cisco.com>
User-Agent: Alpine 2.00 (DEB 1167 2008-08-23)
Organization: People's Front Against WWW
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII
Cc: "v6ops@ietf.org" <v6ops@ietf.org>, "behave@ietf.org" <behave@ietf.org>
Subject: Re: [BEHAVE] [v6ops] Home NAPT44 - How many ports?
X-BeenThere: behave@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: mailing list of BEHAVE IETF WG <behave.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/behave>, <mailto:behave-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/behave>
List-Post: <mailto:behave@ietf.org>
List-Help: <mailto:behave-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/behave>, <mailto:behave-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 17 Jun 2013 05:28:55 -0000

On Thu, 6 Jun 2013, Dan Wing wrote:

> What is the maximum number of mappings supported by your NAPT device? 
> Some residential-class NATs have a limit of 1024 mappings.

I read some RFQ answers for residential gateways lately and at least the 
devices there seemed to support around 2048-4096 mapping.

Other numbers I've heard kicked around is for larger populations of fixed 
line customers (CGN for ADSL and similar tech), one needs to support 
around 30 connections per customer on average. This goes down a bit when 
it's a single mobile device (without tethering), then it's more like 4-6 
TCP connections needed on average.

If I was going to support a student dorm I'm pretty sure the above values 
would be a lot higher though, especially compared to a retirement home 
Wifi :)

-- 
Mikael Abrahamsson    email: swmike@swm.pp.se