Windows Vista flooding network with dhcpv6 renew requests

I have a few Vista Enterprise and they are causing a lot of headaches. I found out that they are doing DHCPv6 Renew every now and then which is not actually a problem but the request comes flooding by the thousands within a few seconds (as shown
below when captured with wireshark) causing a network flood.
fe80::b589:8846:69f9:6f3d ff02::1:2 DHCPv6 196 Renew XID: 0x1c110e CID: 000100011b199761001a4b3f6fba IAA: 2001:x:x:::aae3
Only happened on Vista. There is nothing else to update on the system and could not find solution to this. The only way to stop this is to disable IPv6 on the system which is not actually a solution. Appreciate any help.

Hi,
According to your description, my understanding is that Vista sent a large number of IPv6 renew request and these cause network flood.
There is one record of captured date, and I am not sure if the network flood is caused by duplicate or useless renew requests.
If IPv6 is used on your network, and you have configured clients to obtain IPv6 address from DHCP server, I recommend you to extend the time settings of IPv6 scope, or add another DHCP server to share the workloads.
Best Regards,
Eve Wang
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