nanog mailing list archives
Re: Service providers that NAT their whole network?
From: Tom Vest <tvest () pch net>
Date: Tue, 19 Apr 2005 21:13:28 -0400
On Apr 19, 2005, at 5:25 PM, Owen DeLong wrote:
That makes very little sense to me since the smaller providers can get a /22 directly from ARIN.
Sometimes resources that are come from a regional registry are not welcomed by a national operator. This can go for AS numbers as well as addresses. And sometimes a national operator is the only way out.
I doubt that this becoming more common; sadly, it's probably not becoming less common either.
TV
I, personaly, would never purchase service from a provider that insistedon sticking me behind NAT. SPRINT PCS does not NAT my cellphone. I receive a dynamic address at connection time, but, it is a real address. What they do that annoys me is they block UDP Port 53 to non-sprint nameservers, and, the phone browser is hard-coded to a particular sprint HTTP Proxy server. If the practice is becoming more common, that is very unfortunate. Owen --On Tuesday, April 19, 2005 9:09 AM -0400 Philip Matthews <matthews () nimcatnetworks com> wrote:Thanks to everyone who replied to my question about NAT usage in service providers (see original posting below). I got a lot of private replies, as well as those who posted to the list. To summarize: It seems that there are quite a few providers who do this. I was told of at least 24 providers in the U.S., as well as providers in Canada, in Central America, in Europe, and in Africa which which do this. It was suggested by a number of people that this was quite common on WiFi access and for data services on cell phones. I also heard about a number of cable access providers that do this, and its use on DSL access was mentioned a couple of times. (Many people didn't say what access types were affected, so I don't feel I can derive any meaningful statistics). A number of smaller providers told me that they do it because they simply cannot get enough routable IP addresses from their upstream providers. If I was to speculate, I would guess that the practice might be more common amongst newer providers, and with newer access methods on more established providers. - Philip Philip Matthews wrote:A number of IETF documents(*) state that there are some service providersthat 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 athttp://www.ietf.org/proceedings/02jul/I-D/draft-ietf-sipping-nat- scenarios-00.txt-- If it wasn't crypto-signed, it probably didn't come from me.
Current thread:
- Re: Service providers that NAT their whole network?, (continued)
- Re: Service providers that NAT their whole network? sjk (Apr 15)
- Re: Service providers that NAT their whole network? Steve Meuse (Apr 15)
- Re: Service providers that NAT their whole network? Bill Woodcock (Apr 15)
- Re: Service providers that NAT their whole network? Scott Call (Apr 15)
- Message not available
- Re: Service providers that NAT their whole network? Jay R. Ashworth (Apr 15)
- Re: Service providers that NAT their whole network? Jeff Kell (Apr 15)
- Message not available
- Re: Service providers that NAT their whole network? Chris Woodfield (Apr 22)
- Re: Service providers that NAT their whole network? John Payne (Apr 22)
- Re: Service providers that NAT their whole network? Philip Matthews (Apr 19)
- Re: Service providers that NAT their whole network? Owen DeLong (Apr 19)
- Re: Service providers that NAT their whole network? Tom Vest (Apr 19)
- Re: Service providers that NAT their whole network? Suresh Ramasubramanian (Apr 19)
- Re: Service providers that NAT their whole network? Tom Vest (Apr 19)
- Re: Service providers that NAT their whole network? Suresh Ramasubramanian (Apr 19)
- Re: Service providers that NAT their whole network? Tom Vest (Apr 19)
- Re: Service providers that NAT their whole network? Owen DeLong (Apr 19)