[TriLUG] migrate win server DHCP to OSS

[David Rasch]

Sorry to everyone for sending twice, but this belonged in this thread:

On Thu, Oct 28, 2004 at 01:24:11PM -0400, "gregbrown at mindspring.com" <gregbrown at mindspring.com> wrote:
> Each router with a /24 range has a "helper address" which, I think, forwards DHCP requests from each /24 subnet to one of two DHCP servers, both running older versions of Windows Server.  These servers are quite aged and l'd like to replace them with something OSS (mostly so I can manage these boxes from the command line via SSH and not have to worry about having a broadband connection each time I need to do something to them at night).


These helper addresses are doing what's called DHCP Relay.

It works as follows:
1. Server on w.x.y.z/24 network gets a request, passes it to w.1.1.1
dhcp server via routing
2. Server w.1.1.1 sees that the request was picked up on submit
w.x.y.0/24 and looks for an address pool matching this subnet.  If you
have one defined, it will hand back an address to the relay server
3.  The w.x.y.z/24 network will in turn give the lease to the requesting
client, and the client doesn't know the difference.

For each "pool" you'll need to define the network, netmask, and the
default gateway.  Things like the name servers, etc. can be globally
specified.

The DHCP server can only give out addresses on it's directly connected
interfaces unless a dhcp-relay is involved (also available from ISC).

David

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