[windows2000] Re: SV: DHCP servers in a Windows 2000 AD network
- From: "Goldman, John" <John.Goldman@xxxxxxxxxxxx>
- To: "'windows2000@xxxxxxxxxxxxx'" <windows2000@xxxxxxxxxxxxx>
- Date: Tue, 10 Feb 2004 11:51:40 -0800
There is one issue you are overlooking... 2 servers with the same pool could
each give out the same IP to different clients, and then you have duplicate IP
errors on your clients. Each server is unaware of the others active leases.
John Goldman
Enterprise Microsoft System Administration
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-----Original Message-----
From: Sullivan, Glenn [mailto:GSullivan@xxxxxxxxxxxxxx]
Sent: Tuesday, February 10, 2004 2:14 PM
To: 'windows2000@xxxxxxxxxxxxx'
Subject: [windows2000] Re: SV: DHCP servers in a Windows 2000 AD network
That is a little misleading...
There is nothing stopping you from setting up two servers with the same scope.
They will each have a fair amount of "BAD_ADDRESS" records in their lease
table, but it won't harm anything per say.
So, to clarify, there are better ways to do it than have the same scope on two
different machines, but it is possible to set it up that way.
And I agree with the "cluster" comment. If you've got a whole bunch of
disposable income, send it to me... don't waste your money on the cluster setup
just for DHCP...
Glenn Sullivan, MCSE+I MCDBA
David Clark Company Inc.
-----Original Message-----
From: Svein Arild Haugum [mailto:svein@xxxxxxxxxxxxxx]
Sent: Tuesday, February 10, 2004 1:29 PM
To: windows2000@xxxxxxxxxxxxx
Subject: [windows2000] SV: DHCP servers in a Windows 2000 AD network
You can only have one DHCP server "pr adress".
You can not have
Server 1: 192.168.0.1-255
Server 2: 192.168.0.1-255
But you can have:
Server 1: 192.168.0.1-130
Server 2: 192.168.0.131-255
(This would not work if you use most of your subnets adresses. But if you have
a high lease time, you have good time before clients starts renewing while one
server is down.)
A DHCP client renews his lease after 50% of the total lease time. If the server
that gave him the adress is not avaliable, it tries again, until something like
80% (Not sure about the exact number) before it tries a broadcast, and gets an
adress from the second (or third) server.
This way one server would host adresses if the other goes down.
DHCP is a "Cluster enabled feature". But this requires 2 * Windows 2000
Advanced Server, and some quite expensive hardware. I would not think you
should buy a cluster just for DHCP, but you might use the cluster for this if
you have it for other features, like file sharing or Exchange.
http://support.microsoft.com/default.aspx?scid=kb;EN-US;226796
Mvh
Svein Arild
-----Opprinnelig melding-----
Fra: Rod Falanga [mailto:rfalanga@xxxxxxx]
Sendt: 10. februar 2004 17:59
Til: nmcs@xxxxxxxxxxxxxxx
Kopi: windows2000@xxxxxxxxxxxxx
Emne: [windows2000] DHCP servers in a Windows 2000 AD network
I administer a Windows 2000 Active Directory network. However, I don't have a
lot of training at this sort of thing, but I do have some.
Anyway, I've got a question about DHCP servers in a Windows 2000 AD network.
What I would like to know is, if there is 2 or more servers that act as DHCP
servers, do they replicate information between the 2 of them? Or put
differently, if I want to make one of my servers which isn't a DHCP server,
into a DHCP server, do I have to do some sort of "copying" of information from
the previous DHCP server to the new DHCP server?
Rod
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