Re: DHCP for Multiple Subnets using 1 NIC?
- From: "Kurt" <lorentzenkurt@xxxxxxxxxxxxxxxxxx>
- Date: Sun, 10 Sep 2006 20:26:01 -0700
No need to have a NIC on all three VLANs. In fact, I don't know of a way to
configure a switch to pass broadcasts between VLANs, and even if you could,
how would the server know which subnet it was supposed to assign an address
on?. What you need is a DHCP relay. Most mid-range routers will function as
DHCP relays. A dhcp relay listens for DHCP request broadcasts and does a
unicast to the DHCP server. The relay will use the IP address on the
interface that the DHCP request came from, so that addres will be on the
correct subnet. Windows knows which scope to offer an address from based on
the IP address of the relay.
....kurt
"Bob Simon" <nobody@xxxxxxxxxxx> wrote in message
news:4m76g2psvhne3gnjnjir6donq60sqjscv2@xxxxxxxxxx
I want to segment a flat network covering three floors into three
subnets (using VLANs and a L3 switch) but keep using a single DHCP
server running on Windows Server 2000. Can this be done with a single
NIC in the server?
I can imagine this working by connecting the DHCP server's NIC to a
switch port which is a member of all three VLANs. If Windows Server
supports 802.1q, it could use the VLAN tags to identify which subnet
the client should be assigned an address from. Is this feasible?
.
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