nanog mailing list archives
Re: IP4 Space
From: Nathan Ward <nanog () daork net>
Date: Tue, 23 Mar 2010 16:45:34 +1300
On 19/03/2010, at 4:07 AM, Stan Barber wrote:
1. Almost all home users (not businesses) that are connected to the Internet today via IPv4 are behind some kind of NAT box. In some cases, two NATs (one provided by the home user's router and one provided by some kind of ISP). There is no need for this using IPv6 to communicate with other IPv6 sites.
There are a large number of users, here in NZ at least, but I imagine in other places, that have a single ethernet port "ADSL Modem" which terminates PPP, does IPv4 NAT, DHCP, etc. and then a "Wireless Router" which has its ethernet "Internet" plug connected to the "ADSL Modem", and does IPv4 NAT, DHCP to end hosts, etc. This means that they have double NAT inside the home, and then in the future a potential third NAT. We did some looking at packets, and 17% of outbound packets from customers at an ISP had TTLs that indicated two L3 hops in the home - which for the majority of cases would mean double NAT. In NZ the most popular ADSL deployment is PPPoATM, so the ADSL unit the ISP ships (either loaned, or included in the install cost) is an IPv4 router terminating a PPPoATM connection, not a bridge or anything. -- Nathan Ward
Current thread:
- Re: IP4 Space, (continued)
- Re: IP4 Space Christopher Morrow (Mar 23)
- Re: IP4 Space Owen DeLong (Mar 24)
- Re: IP4 Space bmanning (Mar 24)
- RE: IP4 Space Frank Bulk - iName.com (Mar 24)
- Re: IP4 Space Dave Israel (Mar 24)
- Re: IP4 Space Bill Stewart (Mar 24)
- Re: IP4 Space Steven Bellovin (Mar 24)
- Re: IP4 Space Lamar Owen (Mar 26)
- Re: IP4 Space David Conrad (Mar 23)
- Re: IP4 Space isabel dias (Mar 23)
- Re: IP4 Space Nathan Ward (Mar 22)
- Re: IP4 Space Tim Durack (Mar 05)
- Re: IP4 Space Jeff McAdams (Mar 05)
- Re: IP4 Space Chris Adams (Mar 05)
- RE: IP4 Space Thomas Magill (Mar 05)
- Re: IP4 Space Owen DeLong (Mar 05)
- RE: IP4 Space Thomas Magill (Mar 05)
- Re: IP4 Space Owen DeLong (Mar 05)