DHCP Server Event ID 10020

I have two (2) Windows 2012 R2 DC's
Both have dual network adapters.
Both have one network adapter disabled.

Every time I restart the Server I get this event message 10020

Log Name:      System
Source:        Microsoft-Windows-DHCP-Server
Date:          7/8/2015 11:51:11 PM
Event ID:      10020
Task Category: None
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      SERV011.FQDN.com
Description:
This computer has at least one dynamically assigned IPv6 address.For reliable DHCPv6 server operation, you should use only static IPv6 addresses.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-Windows-DHCP-Server" Guid="{6D64F02C-A125-4DAC-9A01-F0555B41CA84}" EventSourceName="DhcpServer" />
    <EventID Qualifiers="0">10020</EventID>
    <Version>0</Version>
    <Level>3</Level>
    <Task>0</Task>
    <Opcode>0</Opcode>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2015-07-09T03:51:11.000000000Z" />
    <EventRecordID>12126</EventRecordID>
    <Correlation />
    <Execution ProcessID="0" ThreadID="0" />
    <Channel>System</Channel>
    <Computer>SERV011.FQDN.com</Computer>
    <Security />
  </System>
  <EventData>
  </EventData>
</Event>


On the Network adapters I Disabled ipv6  


I also used the registry info in the article below

http://www.hpc.mil/index.php/2013-08-29-16-03-23/networking-overview/2013-10-03-17-24-38/ipv6-knowledge-base-ip-transport/disabling-ipv6-in-microsoft-windows-8-and-server-2012


C:\>reg query hkey_local_machine\system\currentcontrolset\services\tcpip6\parameters /v disabledcomponents

HKEY_LOCAL_MACHINE\system\currentcontrolset\services\tcpip6\parameters
    disabledcomponents    REG_DWORD    0x1


C:\>


Thoughts

Thanks
LVL 23
Thomas GrassiSystems AdministratorAsked:
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arnoldCommented:
disable the IPv6 within the DHCP server console setup if enabled.
Craig BeckCommented:
... Or just ignore the warning.
Thomas GrassiSystems AdministratorAuthor Commented:
Arnold

How do I disable IPV6 using the DCHP server console?

I do not see an option any where to do that.

Craigbeck.

Seems that if we ignore this warning and then that warning why even have the warning or error displayed?
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arnoldCommented:
within the dhcp server console, you should have ipv4 and ipv6 hierarchy where ..

the problem, is since win2008, ipv6 is used and should not be disabled, reconfigure ipv6 to a private/static ip,......

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arnoldCommented:
you can try faking it out, check the ipv6 under the adapter, change it to static, then disable it.
Thomas GrassiSystems AdministratorAuthor Commented:
Arnold,

I found this article from MS
https://support.microsoft.com/en-us/kb/929852

In the posting above I showed that I made that registry change.

So I am guessing that IPV6 is not disabled

But I see where your going here.
This computer has at least one dynamically assigned IPv6 address.For reliable DHCPv6 server operation, you should use only static IPv6 addresses.

Never setup an IPV6 address

suggestions?
Craig BeckCommented:
You have the warning because you're running the DHCP service. As the service can give addresses to IPv6 clients it's simply warning that you dont have a static IPv6 address set on the server. That's by design.

If you don't use IPv6 you can just ignore the warning.

Microsoft actually advise against disabling IPv6,whether you use it or not.
Thomas GrassiSystems AdministratorAuthor Commented:
Craig

If I give the network adapter a static IPv6 address will that cause any issues on the server ?

I thought a read somewhere having an IPv4 and IPv6 can cause issues is that true?

Should I take the IPv4 address an convert it to IPv6

My servers IP address is 10.2.8.30

The IPv6 would be ?
arnoldCommented:
Pick a Private IP block for USE on IPv6.

There are circumstances under which disabling IPv6 could have an adverse effect on the system.

http://www.simpledns.com/private-ipv6.aspx
Craig BeckCommented:
There's no point in assigning an IPv6 address if you don't need to use one.  Just leave it set to auto-assigned.

The warning can be safely ignored.  If you don't have a static IPv6 address the server will not hand out any IPv6 addressing.  The IPv4 element will still work properly.
Thomas GrassiSystems AdministratorAuthor Commented:
Don't you think it would be wise to assign one?

Since all servers use static IP address


I created one let's see what happens

Need to schedule a restart
arnoldCommented:
why do you think you need a restart?

ipv6/dhcp changes do not require a restart.

if you are to configure ipv6 scope, do not set a default gateway unless your external router/firewall supports ipv6 addressing/routing and on which you setup ipv6 address on your selected private segment as well as established required rules to function as nat for those systems..
Craig BeckCommented:
No, if you're using IPv4 addressing and none of your devices need IPv6, why worry about IPv6?

Really, just do nothing and ignore the warnings. Nothing will break and everything IPv4 will work perfectly.
Thomas GrassiSystems AdministratorAuthor Commented:
Arnold

I have a Meraki mx 60 router which supports IPv6

Think I will check all my devices to see if they support IPv6

And then will set up a scope

Checking them now
arnoldCommented:
the IPv6 can be just for internal communications between devices supporting ipv6

the external can wait until the ipv6 scope does can be whown not to have an adverse impact .....
Thomas GrassiSystems AdministratorAuthor Commented:
Thanks guys

After enabling IPV6 and giving the Server a static IPV6 address the error went away it was exactly what it was saying missing ip address.


I setup my DHCP server for  IPV6  setup reservations for some machines

All servers now have IPV6 enabled and have a ipv6 address.

I have one server that will not register the ipv6 address in DNS

Can you guys take a look at this one

http://www.experts-exchange.com/questions/28706836/Windows-2012-R2-Server-Fails-Register-RR's-to-DNS-Event-ID-8018.html 


Thanks again
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