When I was doing the config for Interop two weeks ago in Las vegas (I was the lead of the design and implementation there), then we used /127 actually... a weird thing from an engineering perspective is that addressing looks weird actually if one is used for /30's in a v4 world... For example: 2001:db8:C15c:0::/127 has as two addresses on the link: 2001:db8:C15c:0::/127 (this one looks weird to start of with actually) and 2001:db8:C15c:0::1/127 While if it would have been a /126 2001:db8:C15c:0::1/126 and 2001:db8:C15c:0::2/126 Which matches much more the /30 stuff in v4: 192.168.1.1/30 and 192.168.1.2/30 I can tell you many people were very confused about this little change and as result many made mistakes configuring p2p's during the Interop event G/ -----Original Message----- From: ipv6-wg-admin@ripe.net [mailto:ipv6-wg-admin@ripe.net] On Behalf Of Marco Hogewoning Sent: 26 May 2011 10:36 To: Pierre-Yves Maunier Cc: Jasper Jans; ipv6-wg@ripe.net Subject: Re: [ipv6-wg] IPv6 on P2P links
on our side we use /126 for P2P links. I've heard some others using /64 or /127. Some allocate a /64 but configure a /126 to always have :1 and :2 in order to avoid mistakes by calculating the good hosts ip addresses.
Curious, why did you pick /126 ? What do you do with ::0 and ::3 ? Marco