Quickie on DHCP Split Scope and reservations

[Giorgio]

Hi

I am setting up 80/20 split DHCP

I have a range 10.140.0.1 to 10.140.9.254 which I have setup on both servers

Server 1 has exclusion of 10.140.8.1 to 10.140.9.254 (80% server)

Server 2 has exclusion of 10.140.0.1 to 10.140.7.254 (20% server)

My question is if I need a reservation for a clicnt with IP say 10.140.0.50
I would obviously set this up on Server 1 but what about server 2 as this
address is excluded?

What happens to if server 1 is offline?

Thanks

 

[Newell White]

RE: Quickie on DHCP Split Scope and reservations


"Giorgio" wrote:

> Hi
>
> I am setting up 80/20 split DHCP
>
> I have a range 10.140.0.1 to 10.140.9.254 which I have setup on both servers
>
> Server 1 has exclusion of 10.140.8.1 to 10.140.9.254 (80% server)
>
> Server 2 has exclusion of 10.140.0.1 to 10.140.7.254 (20% server)
>
> My question is if I need a reservation for a clicnt with IP say 10.140.0.50
> I would obviously set this up on Server 1 but what about server 2 as this
> address is excluded?
>
> What happens to if server 1 is offline?
>
> Thanks
>
>
Reservations do not count as 'addresses for distribution'.

So split your scope into 3 ranges - distribution by server1, distribution by
server2, and reservation.
Set up identical reservations on both servers.

Two questions:

1) If you want this to work when one server goes down for some time, what is
the attraction of 80:20 over 50:50?

2) How many hosts do you have? All ethernet traffic on your subnet is
broadcast to all devices - conventional wisdom is to not put more than 254
hosts on one subnet. But wide availability of 1Gigabit/s kit may have
overthrown this somewhat.
--
Regards,
Newell White