[Kea-users] DHCPv6 flooding by Windows 11 24H2 clients

[rme at bluemail.ch]

Hello Marek

Thanks for your reply.

> I read this article:
> 
> https://www.zdnet.com/article/windows-11-24h2-bug-list-updated-one-fixed-12-to-go/
> In section 6 there are mentioned some major problems in networking and obtaining IP addresses. I suspect this could be related to your problem. After reading the article I was afraid to do the upgrade so I do not have any 24H2 update until now, so I am not able to confirm the behavior. I any of the machines in the network gets the update I will check for you to confirm.

Well, could be related. The Microsoft community discussion linked is 
very long but mainly seem to complain about IPv4 connectivity where I 
never faced issues. But of course it might be related as the issues seem 
to be network stack related.

I noticed these renewal-loop all the way back in November I think and 
it's still there whenever I set up a fresh Windows. While I am 
personally almost entirely moving away from Windows I see this issue 
becoming a potential problem in larger scale office networks as soon as 
they move/upgrade to Windows 11 24H2. Specifically as we move towards 
the EoL of Windows 10 in October 2025.

I agree that this is likely not a kea issue at all but I was hoping to 
confirm if anybody else seeing the same issues and if there is ways to 
work-around it (e.g. setting specific DHCP options for Windows 11 24H2).

Darren already replied with some mitigations. They don't prevent the 
problem but perhaps help in case of large-scale rollout of 24H2 causing 
significant load-increase on DHCP and DDNS.

Thanks for your reply and let's keep an eye on it.

Rainer