backup DHCP servers

[Guest]

I got a dhcp server in each two domain controllers in a single domain. Each
domain controller with a dhcp server reside in either of sites. one site has
192.168.0.0/24 network while the other site has 10.0.0.0/24. when one of the
domain controllers in the site is down If I add second scope into each DHCP
servers, will it suppport each other networks?
If possible, how can I do it properly?

 

[Richard G. Harper]

If the sites are routed so each site can see the other, you would only need
to transfer the zone (or a recent backup of the zone) across the servers.
If they aren't routed so they can see each other, well, you will need to
accomplish that first.

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[Guest]

If the sites are routed so each site can see the other, you would only need
to transfer the zone (or a recent backup of the zone) across the servers.
If they aren't routed so they can see each other, well, you will need to
accomplish that first.

--
Richard G. Harper [MVP Shell/User] (e-mail address removed)
* PLEASE post all messages and replies in the newsgroups
* for the benefit of all. Private mail is usually not replied to.
* My website, such as it is ... http://rgharper.mvps.org/
* HELP us help YOU ... http://www.dts-l.org/goodpost.htm

I got a dhcp server in each two domain controllers in a single domain.
Each
domain controller with a dhcp server reside in either of sites. one site
has
192.168.0.0/24 network while the other site has 10.0.0.0/24. when one of
the
domain controllers in the site is down If I add second scope into each
DHCP
servers, will it suppport each other networks?
If possible, how can I do it properly?

Sites are routed and can see each other. I am wondering If I add second scope into DHCP server in Site A for the site B does any conflict occur? note that there is a dhcp server running in site B . What I want to do is support each dhcp servers in seperate sites. either of domain controllers is failover. is one of them able to backup the other?

 

[Richard G. Harper]

There are a couple ways to do this.

One is to set up DHCP servers on each subnet and divide up addresses in a
60/40 ratio - that is, on the DHCP server that primarily serves the
192.168.0.x range put 60% of the available addresses on that server, then
set up a 192.168.0.x range on the 10.0.0.x server and give 40% of the
available addresses to that server. You'll have to mirror reservations
between both servers. This has the benefit of being 100% instantaneous but
the risk of some DHCP traffic taking needless routes to the other server.

The other, if you can spare a few minutes of downtime, is to use the
Microsoft DHCP Export/Import
(http://www.microsoft.com/windows2000/techinfo/reskit/tools/new/dhcpexim-o.asp)
tool to back up each range and store the backup files in a different
location, perhaps on a server both subnets can see. When one server goes
down you use the tool to import and activate the range on the backup server.
This has the benefit of being very easy to use but if you don't make the
backup often enough you could lose reservations or leases in the
import/activate step.

--
Richard G. Harper [MVP Shell/User] (e-mail address removed)
* PLEASE post all messages and replies in the newsgroups
* for the benefit of all. Private mail is usually not replied to.
* My website, such as it is ... http://rgharper.mvps.org/
* HELP us help YOU ... http://www.dts-l.org/goodpost.htm

If the sites are routed so each site can see the other, you would only
need
to transfer the zone (or a recent backup of the zone) across the servers.
If they aren't routed so they can see each other, well, you will need to
accomplish that first.

--
Richard G. Harper [MVP Shell/User] (e-mail address removed)
* PLEASE post all messages and replies in the newsgroups
* for the benefit of all. Private mail is usually not replied to.
* My website, such as it is ... http://rgharper.mvps.org/
* HELP us help YOU ... http://www.dts-l.org/goodpost.htm

I got a dhcp server in each two domain controllers in a single domain.
Each
domain controller with a dhcp server reside in either of sites. one
site
has
192.168.0.0/24 network while the other site has 10.0.0.0/24. when one
of
the
domain controllers in the site is down If I add second scope into each
DHCP
servers, will it suppport each other networks?
If possible, how can I do it properly?

Sites are routed and can see each other. I am wondering If I add second
scope into DHCP server in Site A for the site B does any conflict occur?
note that there is a dhcp server running in site B . What I want to do is
support each dhcp servers in seperate sites. either of domain controllers
is failover. is one of them able to backup the other?