The really scary thing is that deploying carrier-grade NAT might be cheaper to the service provider than rolling IPv6 to its residential subscribers. Frank -----Original Message----- From: Kevin Oberman [mailto:oberman@es.net] Sent: Tuesday, February 17, 2009 3:30 PM To: Owen DeLong Cc: 'Carl Rosevear'; nanog@nanog.org Subject: Re: IPv6 Confusion <snip> The big iron folks are proposing something called "Carrier Grade NAT". This one REALLY frightens me, but I understand a couple of hardware manufacturers are planning on building such a monster. It might actually work, but the amount of state carried strikes me as in invitation to disaster. There was a draft on CNG, but it expired last month. A copy is still available at: http://smakd.potaroo.net/ietf/all-ids/draft-nishitani-cgn-00.txt Also, a proposal for a different approach is at: http://mice.cs.columbia.edu/getTechreport.php?techreportID=560 (PDF) If you are really concerned about where we go whan v4 address space is exhausted, I strongly urge you to look at all of these issues. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634 Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751