|
|
|
|
|
|
|
|
|
|
|
|
| home | help | back | first | fref | pref | prev | next | nref | lref | last | post |
In-Reply-To: <42FA9A8B.8050606@hotnic.net> Cc: NANOG list <nanog@merit.edu> From: Iljitsch van Beijnum <iljitsch@muada.com> Date: Thu, 11 Aug 2005 09:44:44 +0200 To: Kevin Loch <kloch@hotnic.net> Errors-To: owner-nanog@merit.edu On 11-aug-2005, at 2:23, Kevin Loch wrote: >> And on that vein perhaps it's prudent for people using network >> prefixes longer than /64 to take care to ensure that the bit >> positions >> in the IPv6 address that should correspond to the u and g bits in the >> modified EUI-64 interface ID (according to RFC 3513) are both set to > Is there any known use for those bits? The universal/local bit is copied from the EUI-64/MAC address and flipped, and indicates whether the address is derived from something (supposedly) globally unique or not. Both occur frequently, non- unique stem from manual configuration or RFC 3041 temporary/privacy addresses. The group bit isn't relevant, although you won't see MAC- derived addresses with this bit set, of course. There is no real reason to preserve these bits when the prefix length is > 64.
|
|
|
|
|
|
|
|
|
|
|
|
| home | help | back | first | fref | pref | prev | next | nref | lref | last | post |