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

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

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Date: Mon, 17 Jun 2013 07:28:53 +0200
From: Mikael Abrahamsson <swmike@swm.pp.se>
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Cc: "v6ops@ietf.org" <v6ops@ietf.org>, "behave@ietf.org" <behave@ietf.org>
Subject: Re: [BEHAVE] [v6ops] Home NAPT44 - How many ports?
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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

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