DHCPv6 Not Renewing Leases

bimmerdriver

I've found DHCPv6 to be flakey at the best of times and I reported a bug about them (https://redmine.pfsense.org/issues/6717). (I'm testing 2.4 on a windows 2012R2 hyper-v server with windows 10 guests.) Lately, I've noticed DHCPv6 has changed for the worse. Whereas most of the time, I could force a lease to renew by disabling and enabling the ethernet interface, that's not working. Rebooting the pc will sometimes work, as will explicitly doing ipconfig /release6 and /renew6. If I don't renew the lease using ipconfig, it will expire and not be automatically renewed. I'm wondering if anyone else has noticed this.

Inq

I have the same problem. At first i thought that it was a problem with my W10 machines.
Here is the output of netsh int ipv6 show addresses:

Interface 6: Ethernet

Addr Type DAD State Valid Life Pref. Life Address
–------- ----------- ---------- ---------- ------------------------
Public Preferred 23h49m31s 3h49m31s 2a02:2f04:146:2500:xxxx:xxxx:xxxx:xxxx
Temporary Preferred 23h49m31s 3h49m31s 2a02:2f04:146:2500:911a:4e47:6ac9:d78c
Other Preferred infinite infinite fe80::xxxx:xxxx:xxxx:xxxx%6

After ipconfig /renew6 :

Interface 6: Ethernet

Addr Type DAD State Valid Life Pref. Life Address
--------- ----------- ---------- ---------- ------------------------
Dhcp Preferred 1h59m28s 1h14m28s 2a02:2f04:146:2500::xxxx
Public Preferred 23h59m28s 3h59m28s 2a02:2f04:146:2500:xxxx:xxxx:xxxx:xxxx
Temporary Preferred 23h59m28s 3h59m28s 2a02:2f04:146:2500:911a:4e47:6ac9:d78c
Other Preferred infinite infinite fe80::xxxx:xxxx:xxxx:xxxx%6

After 1h15 min the dhcp address usually gets deprecated.

Standard 2.3.2 x64 install.

Later edit:

After some digging i've found this post on he.net forums https://forums.he.net/index.php?topic=3606.0 referring this https://social.msdn.microsoft.com/Forums/en-US/7f076f49-4e0d-494c-8d98-5dc9acbe76f5/windows-10-anniversary-update-breaks-dhcpv6-client?forum=windbg
and this https://social.technet.microsoft.com/Forums/windows/en-US/b16e7d78-e390-4ada-a24b-3ccba60fa571/no-ipv6-dns-statelessdhcp-since-windows-10-anniversary-update?forum=win10itpronetworking

Looks like a Microsoft bug.

bimmerdriver

Good catch. I'll report that on the feedback hub, for what good that will do.