[79831] in North American Network Operators' Group
RE: Service providers that NAT their whole network?
daemon@ATHENA.MIT.EDU (Reeves, Rob)
Fri Apr 15 17:16:29 2005
Date: Fri, 15 Apr 2005 21:15:01 -0000
From: "Reeves, Rob" <rreeves@arbinet.com>
To: <nanog@merit.edu>
Errors-To: owner-nanog@merit.edu
Back when I worked at RCN in 1999, they had begun putting cable modem
customers behind NAT using 10/8 addresses. This occasionally drew
complaints from customers who were expecting a public IP (probably
wanted to host a server), but they weren't given much choice. Whether
or not they're still NATing, I have no idea.
I can see the benefits for residential services like cable modem or even
dial-up when there will never be a need for multihoming. Practically
unlimited IP pool, and I assume it's easier to control things like worm
propogation (correct me if I'm wrong). However, I'm sure there's
several compromises you'd have to make in order to operate this way.
-Rob
-----Original Message-----
From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of
Philip Matthews
Sent: Friday, April 15, 2005 3:40 PM
To: nanog@merit.edu
Subject: Service providers that NAT their whole network?
A number of IETF documents(*) state that there are some service
providers that place a NAT box in front of their entire network, so all
their customers get private addresses rather than public address. It is
often stated that these are primarily cable-based providers.
I am trying to get a handle on how common this practice is.
No one that I have asked seems to know any provider that does this, and
a search of a few FAQs plus about an hour of Googling hasn't turned up
anything definite (but maybe I am using the wrong keywords ...).
Can anyone give me some names of providers that do this?
Can anyone point me at any documents that indicate how common this
practice is?
- Philip
(*) Some IETF documents that mention this practice:
- RFC 3489
- draft-ietf-sipping-nat-scenarios-00.txt
(now expired, but available at
=20
http://www.ietf.org/proceedings/02jul/I-D/draft-ietf-sipping-nat-scenari
os-00.txt
