Windows 10: DHCPv6

Hello Everyone ,


have a problem since 2 days some pcs getting ipv6 and for your info i deploy DHCPv4 only on windows server 2016 .


can i know who DHCPv6 server or Device .





:)

 

Windows 10 Anniversary Update breaks DHCPv6 client

I have an IPv6 enabled LAN. I use Stateless Address Autoconfiguration (M flag on the router set to 0) and Stateful Other configuration (O flag set to 1) so the IPv6 clients generate thier own IPv6 addresses and use DHCPv6 to obtain the DNS server IPv6 addresses.
I have a couple of Windows 2008 R2 DHCP servers with just Global Server Options configured under IPv6. These options are '23 DNS Recursive Name Server IPv6 Address List' and '24 Domain Search List'. These servers are on different networks so I have DHCPv6
forwarding configured on my layer-3 switches to the IPv6 addresses of the two DHCPv6 servers.

This has worked effortlessly with Windows Vista, Windows 7 and Windows 2008/R2 as well as Windows 10 version 1511. The clients see the router advertisements with the M flag set to 0 and the O flag set to 1 and generate their own IPv6 addresses and then
send a DHCPv6 Information Request requesting options 23, 24, 17 & 32. The DHCPv6 server responds with options 23 & 24 and the client gets the IPv6 DNS servers.

I have built a couple of machines with the new Windows 10 Anniversay Update and the DHCPv6 behaviour has changed. The client generates its own stateless IPv6 addresses but no longer sends a DHCPv6 Information Request and instead sends a Solicit like it
would if the M flag was set to 1. Obviously the DHCPv6 server does not respond since it doesn't have a scope configured for the clients prefix.

This is what it shows on the client:

netsh interface ipv6>show dnsservers

Configuration for interface "Ethernet"

DNS servers configured through DHCP: None

Register with which suffix: Primary only

Configuration for interface "WiFi"

DNS servers configured through DHCP: None

Register with which suffix: Primary only

netsh interface ipv6>show interface wifi

Interface WiFi Parameters

----------------------------------------------

IfLuid : wireless_32768

IfIndex : 3

State : connected

Metric : 40

Link MTU : 1500 bytes

Reachable Time : 18500 ms

Base Reachable Time : 30000 ms

Retransmission Interval : 1000 ms

DAD Transmits : 1

Site Prefix Length : 64

Site Id : 1

Forwarding : disabled

Advertising : disabled

Neighbor Discovery : enabled

Neighbor Unreachability Detection : enabled

Router Discovery : enabled

Managed Address Configuration : disabled

Other Stateful Configuration : enabled

Weak Host Sends : disabled

Weak Host Receives : disabled

Use Automatic Metric : enabled

Ignore Default Routes : disabled

Advertised Router Lifetime : 1800 seconds

Advertise Default Route : disabled

Current Hop Limit : 64

Force ARPND Wake up patterns : disabled

Directed MAC Wake up patterns : disabled

ECN capability : application

netsh interface ipv6>

I tried adding a scope to the DHCPv6 server and it does reply and I can see in the WireShark trace that options 23 & 24 are given, however the client does not complete the DHCPv6 process and still shows no IPv6 DNS Servers received via DHCPv6. I can
see that it knows the M & O flags are now both set to 1:

Managed Address Configuration : enabled

Other Stateful Configuration : enabled

I have compared this behaviour to a Windows 7 SP1 host and whether I use Stateless DHCPv6 (M=0, O=1) or Stateful DHCPv6 (M=1, O=1) it works perfectly.

I am guessing that this is a bug in the IPv6 stack in Windows 10 Anniversary Update? I have seen some other people complaining about this issue so has Microsoft acknowledged it and commited to providing a fix?

Andy

 

Does WINDOWS support RFC3315 dhcpv6 reconfigure feature?

Hi Anne,

In the link, it does not mention if windows support DHCPv6 reconfigure option or not.

I test with windows 7 & 10, and OS always returns "port unreachable" when receive DHCPv6 reconfigure from DHCPv6 server.

Thanks!

 

DHCPv6-client


I'm getting multiple DHCPv6-client errors in my event viewer event id 1000 your computer has lost the lease to it's ip address and event id 1003 your computer was not able to renew it's address from the network. I've tried to google this but there isn't much info on it. Anyone know how to fix this?