Subject: Re: [IETF] back by popular demand - a DNS calculator

From: Ray Bellis <[email-masked]>
Date: Wed, 20 Mar 2013 10:50:05 +0000

On 21 Feb 2013, at 02:46, Carlos M. martinez <[email-masked]<mailto:[email-masked]>> wrote:

Wasn't the 'evil bit' able to hold the value 2 ?

Use all evil bits for IP addresses and we'll soon have no need for IPv6.

Geoff Huston and I wrote a draft to use the evil bit to indicate the presence of IPv4 NATs.  It could be used as a tie-breaker for Happy Eyeballs.  It's expired, though.

<http://tools.ietf.org/html/draft-bellis-behave-natpresent-00>

Ray