[159831] in North American Network Operators' Group
Re: CGN fixed/hashed nat question
daemon@ATHENA.MIT.EDU (Jean-Francois Mezei)
Wed Jan 23 16:32:03 2013
Date: Wed, 23 Jan 2013 16:31:47 -0500
From: Jean-Francois Mezei <jfmezei_nanog@vaxination.ca>
To: nanog@nanog.org
In-Reply-To: <50FFD9BE.8080601@foobar.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Question abbout CGN:
Generally speaking for CGN setups, how many end users are NATed to a
single public IP address ?
In terms of traceability, there is a huge difference between loading
200k end users onto 1 public IP and putting say 5 end users per public IP.
In the later case, it becomes possible to assign a good range of ports
to each of the 5 users on that IP address. In the former case, it isn't.
An ISP who nats 5 customers to each public IP address reduces fivefold
the need for pulic IP addresses, which is still a major accomplishement.
