DHCP

[Walter]

We have 2 DHCP servers running on 2 domain controllers
for the same domain. One is using a lower level addresses
like 10.0.0.50-100 with a subnet mask of 255.0.0.0 and
the other is 10.0.0.101-255 with a subnet mask of
255.255.0.0. What is best practice for having 2 in case
one serveer is down and shouldn't they be on the same
subnet mask. 2 windows 2000 server which are DC's.

Thanks for the help

 

[Ace Fekay [MVP]]

In

We have 2 DHCP servers running on 2 domain controllers
for the same domain. One is using a lower level addresses
like 10.0.0.50-100 with a subnet mask of 255.0.0.0 and
the other is 10.0.0.101-255 with a subnet mask of
255.255.0.0. What is best practice for having 2 in case
one serveer is down and shouldn't they be on the same
subnet mask. 2 windows 2000 server which are DC's.

Thanks for the help

You may as well chop the mask down to 255.255.255.0 since looking at your
range, going to assume you don't have 250 hosts? Keep in mind however, if
you were to use this mask, you won't be able to use 10.0.0.255 as an IP
address.

Anyway, the 80/20 rule would be better off for you:

DHCP 80-20 Rule:
http://www.microsoft.com/windows200.../techinfo/reskit/en-us/cnet/cncb_dhc_ogjw.asp

DHCP Redundancy and the 80-20 Rule :
http://networking.earthweb.com/netsysm/print.php/10954_3321141_3




--
Regards,
Ace

Please direct all replies ONLY to the Microsoft public newsgroup so all
can benefit. This posting is provided "AS-IS" with no warranties and
confers no rights.

Ace Fekay, MCSE 2000, MCSE+I, MCSA, MCT, MVP
Microsoft Windows MVP - Active Directory

HAM AND EGGS: A day's work for a chicken; A lifetime commitment for a
pig. --
=================================

 

[CJT]

We have 2 DHCP servers running on 2 domain controllers
for the same domain. One is using a lower level addresses
like 10.0.0.50-100 with a subnet mask of 255.0.0.0 and
the other is 10.0.0.101-255 with a subnet mask of
255.255.0.0. What is best practice for having 2 in case
one serveer is down and shouldn't they be on the same
subnet mask. 2 windows 2000 server which are DC's.

Thanks for the help

Somebody should go to a basic networking school. The obvious
first question is why you've set one up as Class A and the
other as Class B, when they should probably actually both be
Class C? An obvious second question is why one is managing
so many more addresses than the other?

Nobody will be able to give a full answer your question without
some information about precisely how large your network is, the
need (or lack thereof) for subnetting, and any other issues that
might have informed how you've set things up so far (e.g. what
you're doing for name service).

BTW, unless you're having severe problems keeping your DHCP server
up for some reason (in which case maybe that's what you should
focus on), it's not clear why you would even need redundant servers
for a small network (i.e. one with only about 50 clients); not only
is that so small you could probably serve it with the DHCP server
inside many cheap SOHO routers, but a short outage of DHCP isn't
exactly going to bring the house down (unless -- or maybe even if --
you're using it as a replacement for BOOTP or something a bit more
demanding), because you'll probably have it back up before anybody's
lease expires, anyway. In fact, with such a small network, it might
not make sense to use DHCP at all.