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IPV6 DHCP stops giving out ipv6 addresses after 20 minutes, netsh advertise=enabled lost after reboot

Posted on 2013-05-11
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Last Modified: 2014-04-27
Hi,

i have added a Win Server 2012 DC (VM) to my domain and moved all the FSMO roles to it.

i have also moved the DHCP server from a Win Server 2008 R2 DC VM to the 2012 DC VM.

i have IP6 enabled on my network and my DHCP server on the 2008 R2 used to hand out IPV6 addresses no problems.

for the 2102 DC VM to give out IPV6 address the following setting needs to be enabled:

netsh int ipv6 set int 12  advertise=enabled

after about 20 minutes the DCHP IPV6 server stops giving out IP addresses - any IPV6 addresses given out are lost.

if i disable and re-enable advertising then the DCHP ipv6 server starts giving out addresses again.

If i reboot the Win Server 2012 VM then the advertise=enabled setting is lost.

below are the ipv6 nic settings.

C:\>netsh int ipv6 show int 12

Interface Ethernet Parameters
----------------------------------------------
IfLuid                             : ethernet_7
IfIndex                            : 12
State                              : connected
Metric                             : 5
Link MTU                           : 1500 bytes
Reachable Time                     : 34000 ms
Base Reachable Time                : 30000 ms
Retransmission Interval            : 1000 ms
DAD Transmits                      : 1
Site Prefix Length                 : 64
Site Id                            : 1
Forwarding                         : disabled
Advertising                        : enabled
Neighbor Discovery                 : enabled
Neighbor Unreachability Detection  : enabled
Router Discovery                   : enabled
Managed Address Configuration      : enabled
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                  : 0
Force ARPND Wake up patterns       : disabled
Directed MAC Wake up patterns      : disabled
ECN capability                     : application


can anyone help me with this?

thanks

jack
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Question by:jackbenson
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Expert Comment

by:Imtiaz Hasham
ID: 39252391
After it stops giving IP Addresses, could you check the event viewer and advise what's happening please?
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Author Comment

by:jackbenson
ID: 39274902
hi,

thanks for getting back to me.

i am not sure if this helps, but in DHCPv-Client Event, Event ID 1006 - it says:
Router Advertisement settings have been changed on the network adapter 12. The current M - Managed Address Configuration flag is true and the O - Other Stateful Configuration flag is false. User Action: If you are seeing this event frequently, then it could be due to frequent change in M and O flag settings on the router in the network. Please contact your network administrator to have it resolved.

does this shed any light on the matter?

thanks

jack
0
 
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Author Comment

by:jackbenson
ID: 39274945
further inforamtion. i have another server on my network that has RRAS / Direct Access Server istalled.

This is the nic details for that server:

Interface Ethernet Parameters
----------------------------------------------
IfLuid                             : ethernet_7
IfIndex                            : 12
State                              : connected
Metric                             : 5
Link MTU                           : 1500 bytes
Reachable Time                     : 21000 ms
Base Reachable Time                : 30000 ms
Retransmission Interval            : 1000 ms
DAD Transmits                      : 1
Site Prefix Length                 : 64
Site Id                            : 1
Forwarding                         : enabled
Advertising                        : enabled
Neighbor Discovery                 : enabled
Neighbor Unreachability Detection  : enabled
Router Discovery                   : enabled
Managed Address Configuration      : disabled
Other Stateful Configuration       : disabled
Weak Host Sends                    : disabled
Weak Host Receives                 : disabled
Use Automatic Metric               : enabled
Ignore Default Routes              : disabled
Advertised Router Lifetime         : 1800 seconds
Advertise Default Route            : enabled
Current Hop Limit                  : 0
Force ARPND Wake up patterns       : disabled
Directed MAC Wake up patterns      : disabled
ECN capability                     : application
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Accepted Solution

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jackbenson earned 0 total points
ID: 40016202
my draytek router was also advertising DHCP ipv6 addresses - once I stopped that - the problem went away
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Author Closing Comment

by:jackbenson
ID: 40025529
I finally figured out the problem
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