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North American Network Operators Group
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Re: IPv6 Deployment for the LAN
- From: Perry Lorier
- Date: Wed Oct 21 20:20:43 2009
What it does deprive them of, with increasing layers of NAT or proxy
service, is "dial-in" access. Many do not require this feature. The
cost of providing it is increased support costs; debugging two
networks and three or four protocols. Today, even debugging IPv4
problems with customers is problematic and costly enough.
The WAND Networking Research group did some measurements on the number
of clients that accepted at least one incoming TCP connection from
external to their network and presented their results at NZNOG 2009 (
http://www.wand.net.nz/~salcock/nznog09/spnat-nznog.pdf ). The number
of people that successfully accepted at least one incoming TCP
connection was somewhere from 30% to 44%. Most of it seemed to be from
people using bittorrent, but about half was from other protocols.
I'm not so sure it's entirely obvious that people aren't accepting
incoming TCP connections.
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