IPv6 Default Allocation - What size allocation for Loopback Address

Sun Oct 12 16:54:58 UTC 2014

----- On Oct 12, 2014, at 8:53 AM, Sander Steffann sander at steffann.nl wrote:

> Hi,
> 
>> Op 11 okt. 2014, om 23:00 heeft Roland Dobbins <rdobbins at arbor.net> het volgende
>> geschreven:
>> 
>>> On Oct 11, 2014, at 2:09 PM, Tim Raphael <raphael.timothy at gmail.com> wrote:
>>> 
>>>> From my research, various authorities have recommended that a single /64 be
>>>> allocated to router loopbacks with /128s assigned on interfaces.
>>> 
>>> Yes, this is what I advocate for loopbacks.
> 
> I often use the first /64 for loopbacks. Loopbacks are often used for
> management, iBGP etc and having short and easy to read addresses can be
> helpful. Something like 2001:db8::1 is easier to remember and type correctly
> than e.g. 2001:db8:18ba:ff42::1 :)
> 
> Cheers,
> Sander

I concur. I think think some have gotten confused with the suggesting of allocating a /64 for *ALL* loopbacks versus allocating a full /64 per loopback. Loopbacks should be /128, but all loopbacks for a site should be within a single /64 (the first one for reasons others, including Sander have said.

-Randy