Quickie on DHCP Split Scope and reservations

[Guest 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

[Guest 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