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Assigning two static IP's to a single NIC on the domain controller

Posted on 2008-06-19
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Last Modified: 2008-06-22
Hi
I am running server 2003 ent edition domain.  One of my domain controller has 2 NICS, I want it to have ONE NIC.  HOw can I do that.  Is it possible?  Why I want to do that:
-This server is running Sharepoint server and some other websites and all mx records point to that NIC which I want to disable.  
It will be nice and save me lot of hassle to correct the mx records pointing(my ISP has those records) to this particular NIC.
Help plz
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Question by:amanzoor
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Andres Perales earned 400 total points
ID: 21825374
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by:Wadski
ID: 21825421
Depending on the server and network cards you may be able to pool the network cards into one allowing for some redundancy.
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by:amanzoor
ID: 21828006
peralesa:
I agree that I should not have a multihomed (2 NICs) Domain Controller.  Please define why I should not have two static IP's on the same NIC?  I was talking to one of the MVPs and he suggested that I can have 2 static IP's on one NIC on a DC.  I am confused.  Help plz
Wadski:
*****you may be able to pool the network cards into one allowing for some redundancy.
How can I do that?  

Thanks
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by:Andres Perales
ID: 21833174
You can have two IP addresses but has a potential to cause problems with name resoluton and your clients accessing your DC.  which would cause them to not be able to log on to the network...also the more IP addresses you add to a NIC the more it will do and more traffic it will pass.  This could pootentially hinder other services on your machine.  If you do add a 2nd IP address, just make sure that all of your specific servers answer on the specific IP address that you want to answer up on, DNS, WINS, DHCP and such as to not cause confusion and load.
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by:Andres Perales
ID: 21833183
NIC teaming or pooling as is refered has different instructions per different companies, get with the NIC manufacture for their specific instructions on how to team the nics.
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by:The--Captain
The--Captain earned 100 total points
ID: 21836701
>also the more IP addresses you add to a NIC the more it will do and more traffic it
>will pass.

Ummm, no.  That's just wrong.  It should read "the more IP addresses you add to a NIC the more it will do and more traffic it will pass if those additional IP addresses are actually used by services hosted on that machine and given clients that utilize said services."

I have heard of problems with using multiple IPs on a DC (AFAIK, everything works best if the DC has a single IP address), but it sounds like the author has already worked around these issues, or is at least comfortable with his DC having 2 IPs.

In any case, the issue at hand seems to be about whether modifying an existing configuration that utilizes two cards can be reduced to a single card with multiple IPs (aliases).  If each card previously had a maximum load of 25% or less, then you should be able to combine the IPs onto a single card (IIRC, delays on ethernet cards [even when switched] begin to show at around 50% load).

Hope that helps.

Cheers,
-Jon
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