Marco Moock <[email protected]> said:
> > Then check the lifetime of the IPv6 address.

Chris Adams:
> I wrote a little script to watch the list of public v6 IPs, and I see
> this so far this morning (masked the public prefix).  The number at the
> end is the valid_lft seconds.
> 
> 2026-05-21 07:39:17 removed xx::f4f/128 4673
> 2026-05-21 07:39:20 added xx::f4f/128 5400
> 2026-05-21 07:41:20 removed xx:3e8c:f8ff:fe60:1d5a/64 4922
> 2026-05-21 07:41:20 removed xx:7cb1:c518:1be0:d81d/64 4922
> 2026-05-21 07:41:23 added xx:3e8c:f8ff:fe60:1d5a/64 5398
> 2026-05-21 07:41:23 added xx:596a:f6f5:67b2:1d8f/64 5398
> 2026-05-21 08:14:43 added xx:fac3:61f6:ad18:d712/64 4987
> 2026-05-21 08:14:43 removed xx:596a:f6f5:67b2:1d8f/64 4991
> 2026-05-21 08:30:26 added xx:84b4:244e:bb14:94fd/64 5398
> 2026-05-21 08:30:26 removed xx:fac3:61f6:ad18:d712/64 5120
> 
> So addresses are definitely being removed before the lifetime and while
> they're still in use.

That could be a DHCP issue (or whatever something similar, but not
DHCP, is involved in doing the same job), or firewalling getting in the
way at either end.  Though I'd expect some consistency in timing.

Client requests an IP
Server issues one
There's an acknowledgement

And before the lease expires the client should request an extension.

&ou'd expect the client to make this request with a similar time frame
each time (e.g. some clients do it at the half-way point).



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