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Home » Microsoft » Windows Server » Active Directory » Re: Domain Controller Multiple NIC DNS problem
Re: Domain Controller Multiple NIC DNS problem [message #161127] Wed, 16 September 2009 15:39 Go to next message
johnvc  is currently offline johnvc  United States
Messages: 1
Registered: September 2009
Junior Member
Hello . I have read the responses , but find the solutions rather
confusing.
In my case, the second NIC card in my Win2003 DC , DNS, & DHCP server
is connected to a switch dedicated for Internal Backup purposes only and
with another IP subnet 192.168.x.x.
It has File and Print, MS Client, DNS and Netbios all disabled.
Yet when I Enable the secondary card, after a short while, the
secondary DNS IP number is propogated thruout the primary card network
and my users begin to experience connection errors.
Is there a simple solution to this?
Thanks for any advice or suggestions, I am at my wits end with this...
John


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Re: Domain Controller Multiple NIC DNS problem [message #161133 is a reply to message #161127] Thu, 17 September 2009 00:02 Go to previous messageGo to next message
florian  is currently offline florian  Switzerland
Messages: 484
Registered: July 2009
Senior Member
Howdie!

johnvc schrieb:
> Hello . I have read the responses , but find the solutions rather
> confusing.
> In my case, the second NIC card in my Win2003 DC , DNS, & DHCP server
> is connected to a switch dedicated for Internal Backup purposes only and
> with another IP subnet 192.168.x.x.
> It has File and Print, MS Client, DNS and Netbios all disabled.
> Yet when I Enable the secondary card, after a short while, the
> secondary DNS IP number is propogated thruout the primary card network
> and my users begin to experience connection errors.
> Is there a simple solution to this?
> Thanks for any advice or suggestions, I am at my wits end with this...

I've seen changing the NIC binding order with the protocols help - but
that's not the case for 100% of the issues you see.

Microsoft doesn't recommend having a DC be multihomed (that is have
multiple NICs in the DC connected). I'd plan on changing that in the
near future rather than fixing the symtoms.

Cheers,
Florian
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Microsoft MVP - Group Policy
eMail: prename [at] frickelsoft [dot] net.
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Re: Domain Controller Multiple NIC DNS problem [message #161151 is a reply to message #161127] Thu, 17 September 2009 08:34 Go to previous message
aceman  is currently offline aceman  United States
Messages: 5816
Registered: July 2009
Senior Member
"johnvc" <johnvc.3ymn3b@DoNotSpam.com> wrote in message
news:johnvc.3ymn3b@DoNotSpam.com...
>
> Hello . I have read the responses , but find the solutions rather
> confusing.
> In my case, the second NIC card in my Win2003 DC , DNS, & DHCP server
> is connected to a switch dedicated for Internal Backup purposes only and
> with another IP subnet 192.168.x.x.
> It has File and Print, MS Client, DNS and Netbios all disabled.
> Yet when I Enable the secondary card, after a short while, the
> secondary DNS IP number is propogated thruout the primary card network
> and my users begin to experience connection errors.
> Is there a simple solution to this?
> Thanks for any advice or suggestions, I am at my wits end with this...
> John
>
>
> --
> johnvc
> ------------------------------------------------------------ ------------
> johnvc's Profile: http://forums.techarena.in/members/135947.htm
> View this thread: http://forums.techarena.in/active-directory/954155.htm
>
> http://forums.techarena.in
>


John,

As Florian said, multihoming DCs is not recommended. If you *truly* need to
keep the DCs multihomed, I put together a step-by-step to alter a DC
functionality in order to properly register into DNS, however it requires
mutiple changes, including registry alterations.

In my opinion, I would rather have my DCs single homed, and use the
infrastructure's routing to move packets around networks, and not put the DC
on multiple subnets, which also causes problems with AD Site definitions,
because it makes a DC part of more than one Site, which is not recommended
because it goes against the definition of a "site."

Read the following for the step by step. Let us know how you make out.

Multihomed DCs with DNS, RRAS, and/or PPPoE adapters
http://msmvps.com/blogs/acefekay/archive/2009/08/17/multihom ed-dcs-with-dns-rras-and-or-pppoe-adapters.aspx


--
Ace

This posting is provided "AS-IS" with no warranties or guarantees and
confers no rights.

Please reply back to the newsgroup or forum for collaboration benefit among
responding engineers, and to help others benefit from your resolution.

Ace Fekay, MCT, MCTS Exchange, MCSE, MCSA 2003 & 2000, MCSA Messaging
Microsoft Certified Trainer

For urgent issues, please contact Microsoft PSS directly. Please check
http://support.microsoft.com for regional support phone numbers.
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