[125545] in North American Network Operators' Group
Re: Rate of growth on IPv6 not fast enough?
daemon@ATHENA.MIT.EDU (Simon Perreault)
Mon Apr 19 14:07:04 2010
Date: Mon, 19 Apr 2010 14:06:31 -0400
From: Simon Perreault <simon.perreault@viagenie.ca>
To: nanog@nanog.org
In-Reply-To: <4BCC9157.9040507@bryanfields.net>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 2010-04-19 13:22, Bryan Fields wrote:
> If we look a the total number of translations for 250k users we see 10.5M
> entries. As TCP/UDP only has 65,536 ports and about 1025 of them are
> unusable, this leaves 64,511 ports to work with per IP. Divided out we need
> 163 public IP's min just to nat the number of users on a single PDSN pool,
> assuming we have a 1/2 loading thats 326 public IP's for one pool.
This is true only if you use endpoint-independent mapping. With
address-dependent mapping (e.g. pf) or address- and port-dependent
mapping (e.g. Linux) scaling is much better.
Simon
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