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09.14.2007 at 07:55AM PDT, ID: 22829039
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Setting up a second server as a Backup DC
Tags: backup, dc, server, up, second
Our PDC runs W2K3 SBS. I just set up a W2K3 R2 Server to act as a backup DC. I have some questions to make sure that I have it configured correctly.

1. I have established each server in WINS to replicate with each other. Should I also add each server to the WINS of the other so that they both appear or they're fine just set as replication partners.

2. I don't need and can't have DHCP running on the backup DC because the PDC currently controls DHCP, correct? Should I just disable the DHCP service until an event occurs and I need to use the BDC?

3. DNS on the BDC has all the information loaded from replicating already. However, it says the DNS server is not configured yet. Should I configure the DNS for that server? If so are there any pitfalls I should try to avoid?

Thanks for any help.
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Question Stats
Zone: Networking
Question Asked By: msheppard74
Solution Provided By: Shift-3
Participating Experts: 3
Solution Grade: A
Views: 30
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09.14.2007 at 08:26AM PDT, ID: 19892402

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09.14.2007 at 08:39AM PDT, ID: 19892520

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09.14.2007 at 08:54AM PDT, ID: 19892666

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09.17.2007 at 12:05PM PDT, ID: 19907384

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09.17.2007 at 12:40PM PDT, ID: 19907716

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09.17.2007 at 02:28PM PDT, ID: 19908555

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09.17.2007 at 03:57PM PDT, ID: 19909085

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09.18.2007 at 05:43AM PDT, ID: 19912180

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09.18.2007 at 08:41AM PDT, ID: 19913862

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09.14.2007 at 08:26AM PDT, ID: 19892402

Rank: Master

There is no term called BDC or Backup domain controller from WIN2k onwards.  Every DC you create in your environment is a DC by it own standards.  They all have the read/write copy of the DC Database.
DHCP and DNS are not part of your DC.  They are seperate.  DHCP and DNS can be on DCs or can be on different machines.   Those information are not replicated to DCs.
 
09.14.2007 at 08:39AM PDT, ID: 19892520

Rank: Guru

1. You should add the new server as a secondary WINS server in your DHCP scope so that workstations will fail over to it if your first server is down.  Setting it as a secondary on the server won't hurt anything but there isn't much point; if the primary isn't responding then it usually means the server itself is down.

2. You can have DHCP running on both if you set up non-overlapping scopes on the same subnet.  For instance, if the first server's scope is 192.168.0.50 - 192.168.0.100 and the second server's scope is 192.168.0.150 - 192.168.0.200 then they can both hand out IPs without stepping on each other.  This can increase redundancy, but make sure you have enough available IPs for all your workstations if one of the servers goes down for a while.

3. AD-integrated DNS is pretty straightforward.  Just start it on the new server and add it as a secondary DNS server in your DHCP scopes.  All changes should be replicated along with AD.
Accepted Solution
 
09.14.2007 at 08:54AM PDT, ID: 19892666

Rank: Master

When you DCPromo'd the second server, did you have DNS installed beforehand? If not, then you may run into some headaches getting it to run. Active Directory would have picked up that DNS was there and configure it appropriately. A more specific detail on the error would help.

The first two are fine. Just leave DHCP off, and ready to fire up if needed. Make sure that the DNS on the internal NIC is pointing to itself FIRST, and the SBS box second. Make sure WINS is indicated on the opposite box for the NIC properties on each. Test replication to see if any errors appear in the event logs.

Replication Partners is where they need to be.

Philip
Assisted Solution
 
09.17.2007 at 12:05PM PDT, ID: 19907384
Shift-3, I have a question about the following
"3. AD-integrated DNS is pretty straightforward.  Just start it on the new server and add it as a secondary DNS server in your DHCP scopes.  All changes should be replicated along with AD."

What exactly do you mean? Do you mean add it as a secondary DNS under Scope options in DHCP?
 
09.17.2007 at 12:40PM PDT, ID: 19907716
OK so here is what I have set up

SBS Box Primary DC
NIC
IP - 192.168.0.9
S -   255.255.255.0
G -   192.168.0.1

PDNS - 192.168.0.9

WINS
Has SBS Box loaded and  W2K3-R2 box set as replication partner

DHCP -
DNS Servers - SBS Box, W2K3-R2 Box
WINS - SBS Box

W2K3-R2 Box Backup DC
NIC
IP -  192.168.0.14
S -    255.255.255.0
G -   192.168.0.1

PDNS - W2K3-R2 Box
SDNS - SBS Box

WINS -
I have both boxes iloaded here, both set as replication partners to each (do I need both, should it be sufficient enough to only have the W2K3 box here with SBS Box set as its replication partner?)

DHCP -
DNS Servers - SBS Box, W2K3-R2 Box
WINS - W2K3-R2 Box, SBS Box

Do I have this set up correctly?
 
09.17.2007 at 02:28PM PDT, ID: 19908555

Rank: Master

WINS needs to be both ways with push/pull replication.
W2K3-R2 box when installed at the remote office will have a different range as per your VPN router setup. Something like 192.168.12.x/24. You will reset the W2K3-R2 box to that range when you get down there.
Make sure to set the W2K3-R2 box as Global Catalogue Server when it gets installed at the branch site.
Looks pretty good otherwise.
Philip
 
09.17.2007 at 03:57PM PDT, ID: 19909085

Rank: Guru

"What exactly do you mean? Do you mean add it as a secondary DNS under Scope options in DHCP?"

Yes.  DHCP should hand out one server as the primary DNS and the other as secondary.  That way clients will fail over if one of the servers is down.
 
09.18.2007 at 05:43AM PDT, ID: 19912180
MPECSInc - It's not a remote DC it's just a backup DC within the same LAN as the primary DC.

Shift-3 - DHCP server can not be running on a back-up DC on a domain that has SBS as the primary DC. SBS shuts down DHCP if it detects another DHCP server on the network. So for future reference, in a scenario like mine you can not have DHCP running on the back-up domain.

So, it can be running, it just can not be authorized to dole out IP addresses until it's needed.
 
09.18.2007 at 08:41AM PDT, ID: 19913862

Rank: Master

Sorry about that, working on a similar question with remote office in the setup :*|
Philip
 
 
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