independent servers on same subnet

Simon Hobson dhcp1 at
Fri Jul 11 19:38:26 UTC 2008

Japhy Bartlett wrote:

>The way to "decide" is in the routing, no?

No, by definition, if the servers are in the same subnet, they will 
receive the same broadcast messages from clients. There are only two 
ways to do this :

1) Configure each client with information on which server(s) it 
should accept a lease from. However, in the general case this can't 
be done as most client lack this capability.

2) Configure each server with information on which clients to serve 
and this is the commonly used setup. Generally, as long as you can 
define a group of clients, you would configure one server to ignore 
them and serve the rest, and configure the other server to serve only 
these clients and ignore the rest. Selecting clients can be done by 
any criteria you can configure a rule for in both servers - based on 
MAC address, client-id, something unique sent in the packet, the 
presence of a specific option in the request, and many more 

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