[GLLUG] IPv6 address allocation changes

Chris Bell chrisbell at chrisbell.org.uk
Sat Jul 22 13:24:52 UTC 2023

>From www.ripe.net/publications/docs/ripe-682
The minimum IPv6 address block allocated to end users is expected to be a /48.
The minimum IPv6 address allocation to an ISP is a /32, but they are only 
leased, and any block could be re-assigned at any time after 24 months to 
simplify overall allocations, so in effect all are dynamic addresses. This 
could affect huge numbers of networks and devices with various Times To Live. 
Would it be expected that any change should be instantaneous, or could both 
old and new allocations be accepted for a limited period? A change would not 
have noticeable affect for many users, but larger and more complex sites could 
be seriously affected.
Are applications expected to automatically accept a random change to the first 
few (up to 48) bits but keep the following bits up to the standard /64 to 
retain a possibly huge network structure? Should the first 64 bits be 
automatically re-calculated as a precaution?

Chris Bell

More information about the GLLUG mailing list