RE: 70-291: DHCP 20/80 rule

Slightly confused about the 1 in each subnet, but the rest of it reads like
two different methods to achieve the same result.

If you are allocating out 192.168.1.50-254 with subnet mask of
255.255.255.0, you could either:

Have the scope on Server A (80%) range from 192.168.1.50 to 192.168.1.165,
with Server B (20) range as 192.168.1.166 to 192.168.1.254. No exclusions or
reservations on either server.

The other option is to have Server A and Server B scopes range from
192.168.1.50 to 192.168.1.254, and have the exclusion on Server A be
192.168.1.166 to 192.168.1.254, and the exclusion on Server B be 192.168.1.50
to 192.168.1.165.

Both these methods will work, and the goal is the same: to have two DHCP
servers allocating IPs that a) will not conflict/overlap, (b) will work for
any machine that makes a request, ie it does not matter which server the
client gets the address from.

Personally, I prefer to use exclusions for blocks of IP's that are static,
and alter the scope ranges when balancing DHCP. However, you should learn
both, since I can guarantee you will encounter both methods in the real world.
--
Pete Jones
MCSE:Security, MCSE:Messaging


"ISApose" wrote:

Hello, thanks in advance.

I have seen 2 different views of the 80/20 rule. One that states to break
up the scope on 2 different DHCP servers (1 in each subnet), and then what
the MS Press 70-291 book states.

It states to use the same scope on both servers, but break up the exclusion
range, 80% and 20%.

I'm sure the MS Press book is the one I want to go with, but just wanted to
confirm.
.

Relevant Pages

  • Re: RRAS ip routing and ISA
    ... I have an dual homed ISA 2006 enterprise server acting as an edge ... I would like to join another internal subnet, ... stand-alone server as a DHCP server as long as it is not on a subnet ...
    (microsoft.public.windows.server.networking)
  • Re: AD site replication links
    ... OK...to get back to normal...I would move one server at a time back to its ... correct site and ensure that replication is working before moving anymore. ... links, force a KCC check and a forced synchronisation, the whole thing is ... I have a location in Zurich with 1 DC (one subnet) ...
    (microsoft.public.windows.server.active_directory)
  • RE: 2 x DC, 2 sites and NT4 servers same domain HELP
    ... Your understanding is correct that you can add second DC in another subnet ... as long as there is router can provide the route. ... subnet to provide DHCP function for 192.168.86.0 scope will be ... better than using the original DHCP server in 192.168.82.0 subnet. ...
    (microsoft.public.windows.server.migration)
  • Re: windows 2003 active directory and slow logons
    ... so WHY not create a subnet in AD that covers that. ... # Jorge de Almeida Pinto # MVP Windows Server - Directory Services ... DHCP provided by linux box and clients get ip addresses from the ... The remote site has a local DC that is also a DNS for the AD DNS ...
    (microsoft.public.windows.server.active_directory)
  • Re: 2 NIC SBS2003R2 LAN/WAN Firewall Router Connection Failure
    ... I have to admit to a preference for VMWare Server which can only be ... I've asked the other SBS MVP's to comment on the current status of SBS ... I connected directly to the router and changed its LAN side subnet ...
    (microsoft.public.windows.server.sbs)