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At 02:21 PM 4/2/99 -0800, Matthew Levine wrote:
>For fault isolation, its better to have separate local dhcp servers.
>Its better not to put all your eggs in one basket.
Just to play devil's advocate for a moment, using a single centralized DHCP
server means you only have one server to administer.
>Besides, you're
>probably paying a pretty penny for those leased lines (or at least the
>school is) so you probably want to get the most out of them. Putting
>your DHCP negotiations and renewals out on those links is unnecessary
>and wasteful if you can set up local DHCP servers, instead.
Again playing devil's advocate, and not having hard data to back me up, I
would guess that DHCP traffic would represent a vanishingly small fraction
of your WAN traffic. I'd love to hear from anyone with hard numbers that
can disprove or back up my intuition.
>Plus, its probably not a good idea to trust the health of the LAN's to
>the health of the WAN unless you have as much control over the entire
>WAN circuit as you have with your LAN's - even then it sounds a little
>suspect.
On the other hand, DHCP service is, in some circumstances, far less mission
critical than other services such as DNS. In a relatively static
environment, with relatively long leases, minutes or hours of DHCP service
downtime may be acceptable. Of course, while the DHCP service is down, new
hosts and renumbered hosts won't be usable. If you have lots of dynamic
clients, distributed service might be a good choice. If you have a
high-availability WAN that you are using for other
enterprise-mission-critical applicaitions, centralizing DHCP services might
make sense.
- Ralph Droms
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