DHCP and relay agents

[peterve]

Hi,

I want to make my DHCP environment more 'waterproof'.
I have a DHCP server in every site/subnet,
but I want to configure my routers to dhcp relay, and host another piece of the same IP range/subnet on a centralized DHCP server as well. That central server is already hosting a subnet for the local clients, but what will happen if I add the new scopes for the remote sites (which should only be used from the dhcp relay).
How can I make sure the users in the central site will only get an IP address from the 'local' scope, and that remote users will get an IP address from their corresponding scope when dhcp relay is enabled ?


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[WillShakespeare]

Just adding to the discussion...
If the "local" scope is in a particular range (i.e. subnet and ip range), then only those computers with the appropriate Mask will get those IP addresses, right?
But, obviously you might be using the same sized subnets...
I do remember that in the Scope Options there is a switch that forces clients to look at only local subnets... perhaps if you make sure this is not checked, this might work...
This is under Advanced tab, Default Remote Routing and Access Class, 027 All Subnets are Local
There may be some other options there...

hth,

Will

 

[peterve]

what if the DHCP server I'm talking about already serves clients in the local class C network,
and I'm trying to add scopes on that very same server (basically a half class C subnet, the other half is being hosted on the DHCP server that is on-site in the remote location)
If the DHCP relay kicks in, I would assume the router would ask the centralized DHCP server for an IP in the right scope, but what will happen with the local clients ? They should not get an IP address from that second half class C subnet (because it would be reserved for the remote location) How can I make sure the local clients get a local IP, and the remote clients will get a remote IP from the centralized DHCP server when dhcp relay kicks in ?

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