Re: multiple DHCP scopes question

Thank you!

great, clear, explanation. Its appreciated.


"Doug Sherman [MVP]" <dsherman@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:u1$9VYbJGHA.3896@xxxxxxxxxxxxxxxxxxxxxxx
> There are two different ways to service multiple subnets with a single
DHCP
> server:
>
> 1) One of the ways that a DHCP server can service multiple subnets is to
> physically connect an adapter to each subnet with an appropriate static
> address. When a server configured with multiple scopes receives a DHCP
> broadcast discover packet on one of these interfaces, it will
automatically
> offer an IP from the scope which matches the IP that the broadcast was
> received on.
>
> 2) The other way to service multiple scopes is to have one adapter in the
> DHCP server and use relay agents. These can be hardware routers or
> multihomed Windows servers. When a remote relay agent receives a
broadcast
> discover packet, it adds the IP of the interface on which the packet was
> received to the header and then forwards a directed packet to the DHCP
> server. The server then compares its available scopes to the IP in the
> header and offers an address from the matching scope.
>
> Doug Sherman
> MCSE, MCSA, MCP+I, MVP
>
> "djc" <noone@xxxxxxxxxxx> wrote in message
> news:#m0NWDbJGHA.604@xxxxxxxxxxxxxxxxxxxxxxx
> > this has always been a little unclear to me. I have only worked in
> > environments small enough that one dhcp server and one scope was all
that
> > was needed however while studying for things I certianly come accross
DHCP
> > questions concerning multiple scopes. I have seen depictions of networks
> > with multiple subnets all serviced by the same DHCP server with a
> different
> > scope for each subnet.
> >
> > I am unclear as to how the right scope info is picked up by the right
> > subnet/clients?
> >
> > 1) does there need to be a seperate NIC for each respective scope for
each
> > subnet? In other words, does the DHCP server have to have a seperate
> > physical connections for each subnet it services? Thats what I WAS under
> the
> > impression took place but after seeing serveral network depictions in
> sample
> > test questions that do not make that clear I am not sure... plus
> >
> > 2) what about one DHCP server located on subnetA that services that
subnet
> > plus subnetB and subnetC which are behind routers? Each remote subnet
has
> a
> > DHCP Relay agent running (or the router may support it). So how does the
> > DHCP server on subnetA know how to hand out the right scope info for
each
> of
> > these 3 subnets?
> >
> > These may be the same question... In my confused state I'm not sure but
> > asking them both should make clear what I'm trying to find out.
> >
> > any info on this would be greatly appreciated.
> > thanks.
> >
> >
>
>


.

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