Question

Active Directory and subnets

Asked by: lrmoore

In a single, simple stand-alone AD with just one site that has multiple IP subnets routed internally, do you have to add each subnet to the site within AD? What symptoms would you see if you don't?

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Asked On
2007-07-26 at 11:59:59ID22723690
Tags

active

,

directory

,

subnet

,

multiple

Topics

Windows 2003 Server

,

Active Directory

Participating Experts
3
Points
500
Comments
8

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Answers

 

by: LauraEHunterMVPPosted on 2007-07-26 at 12:05:22ID: 19577259

In a single site there's no real reason to configure subnets manually - all of your clients will default to the single site, and will authenticate against the DCs in that single site.

 

by: lrmoorePosted on 2007-07-26 at 12:15:48ID: 19577354

I didn't think so, but wanted to run it by the Experts for a second opinion.
Thanks Laura!

If I have multiple sites should I then register each appropriate subnet to the appropriate site?

 

by: benhansonPosted on 2007-07-26 at 12:19:15ID: 19577390

The subnets are used to determine the best Domain controller to authenticate to.  If you have multiple subnets AND some of those subnets have their own domain controller, then you should set them up and set up sites, then associate the proper subnets with the proper sites.

 

by: benhansonPosted on 2007-07-26 at 12:22:38ID: 19577430

So, as far as symptoms, here is the scenario

Subnet A 192.168.0.x - With Domain Controller - Core Site
Subnet B 192.168.1.x - With Domain Controller - WAN Site, T1 to Sub A
Subnet C 192.168.2.x - No Domain Controller - WAN Site, T1 to Sub A

If you don't have any subnets and sites set up in AD Sites and Services, then users from Subnet C might be persistently authenticating to Subnet B, wasting precious T1 bandwidth at 2 sites.  You may also find users from Subnet B also authenticating to Subnet A, wasting yet more WAN bandwidth.

 

by: lrmoorePosted on 2007-07-26 at 12:29:21ID: 19577502

That's all I needed to know.
Thanks!

 

by: LauraEHunterMVPPosted on 2007-07-26 at 12:31:10ID: 19577519

An AD site is assumed to be "well-connected", in other words a single LAN - even if that LAN extends to multiple physical locations, if all machine can connect to each other at LAN speed, you're fine.

As benhanson describes, if you have bandwidth limitations between your subnets such that you generally want workstations on SubnetA to authenticate to a DC on SubnetA and so forth, then configure a separate site for each well-connected location and site links between them.

 

by: sm_ferozPosted on 2008-01-31 at 05:45:24ID: 20786402

Hi,
IF you assign class A Ip address then you need to enter subnet as 255.0.0.0 and for classB it is 255.255.0.0 for classC 255.255.255.0 depending on this you need to specify the subnet mask.

 

by: sm_ferozPosted on 2008-06-26 at 06:18:55ID: 21874442

Hi,
Subnets are assigned automatically accordingly on range of ip address like classA,ClassB,ClassC,and ClassD ,for classA Ip address subnet mask is 255.0.0.0 for classB it is 255.255.0.0,for classC it is 255.255.255.0 and for classD it is 255.255.255.255.
 

20120131-EE-VQP-002

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