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Unihomed ISA and NLB

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Unihomed ISA and NLB - 11.Nov.2008 7:28:14 PM   
wilbudl

 

Posts: 15
Joined: 23.Jul.2008
Status: offline
Working on building an array in the lab (before attempting production). Reading "ISA Server 2006 Unleashed" as well as Dr. Shinder's "ISA Server 2006 Migration Guide"... Unleashed says that in order to implement NLB in the array, I need to add a second NIC dedicated to NLB communication. Is that true? The array will consist of two unihomed ISA 2006 servers. If there is a better resource for configuring an array of unihomed servers, I'd be very interested in that as well.  CSS will be on a third server.

Thanks in advance!

Regards,
Darryl

< Message edited by wilbudl -- 12.Nov.2008 8:26:39 AM >
Post #: 1
RE: Unihomed ISA and NLB - 12.Nov.2008 6:05:49 PM   
Jason Jones

 

Posts: 4663
Joined: 30.Jul.2002
From: United Kingdom
Status: offline
Hi Darryl,

If you are planning on using unicast NLB (the default mode with ISA integrated NLB) with Windows Server 2003 SP1 you do not need dedicated NICs if you apply the following reg key:

http://support.microsoft.com/kb/898867

If you are planning on using multicast NLB, then you do not need dedicated NICs.

However, it is still recommended for security reasons to have dedicated NICs between array members for intra-array communications, irrespective of using NLB.

http://technet.microsoft.com/en-us/library/bb794718.aspx

Cheers

JJ

_____________________________

Jason Jones | Forefront MVP | Silversands Ltd
My Blogs: http://blog.msedge.org.uk/ and http://blog.msfirewall.org.uk/

(in reply to wilbudl)
Post #: 2
RE: Unihomed ISA and NLB - 13.Nov.2008 9:34:23 PM   
wilbudl

 

Posts: 15
Joined: 23.Jul.2008
Status: offline
It was more of a general question based on the "Single NIC" template that is being used. There is some confusion on using that template if the server actually has 2 NIC's. Just to reiterate, I can use the "Single Interface" template on systems with 2 NIC's providing that the second NIC is dedicated to Intra-Array communication? I would prefer to not use any special registry hack if I don't have to. Both systems already have 2 NIC's, it was just a matter of understanding a valid configuration. Thank you for your help and advice.

Regards,
Darryl

(in reply to Jason Jones)
Post #: 3
RE: Unihomed ISA and NLB - 14.Nov.2008 10:11:13 AM   
Jason Jones

 

Posts: 4663
Joined: 30.Jul.2002
From: United Kingdom
Status: offline
Maybe you should have mentioned templates in your original post then!

I personally use the closest template and then modify it as necessary. I don't think any of the templates actually create and configure a dedicated intra-array network and this needs to be done manually a per MS best practice.

The registry "hack" is only necessary if you do not have dedicated intra-array NICs so this should be unnecessary in your case.

Not 100% sure how you are planning to ue ISA (as you don't say) but I think the single NIC template would probably be the closest to start with. I don't tend to really rely on the templates anymore and prefer to create customised versions for the specific need at the time.

Cheers

JJ

_____________________________

Jason Jones | Forefront MVP | Silversands Ltd
My Blogs: http://blog.msedge.org.uk/ and http://blog.msfirewall.org.uk/

(in reply to wilbudl)
Post #: 4

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