DHCP with multiple subnets -single domain
Hello,
I have two trusted zones on my firewall. Firewall rules / policies allow full communication between the trusted zones. both zones are in the same domain and both zones are physically located in the same building (on different floors).
Each zone has its own domain controller (DC), which is also the DNS server, WINS server and DHCP server.
I would like to implement redundancy with DHCP in case one of the DC's fails.
My understanding is that using DHCP relay agent will solve this problem.
What I don't understand is how each zone knows which ip addresses to use.
For instance, zone 1 uses 10.0.0.0 / 255.255.255.0; zone 2 uses 10.0.1.0 / 255.255.255.0
If the Scope of the DC in zone 1 is defined as 10.0.0.100.. .10.0.0.254 / 10.0.1.0..10.0.1.100 and scope of Dc in zone 2 is defined as 10.0.1.100..10.0.1.254 / 10.0.0.0..10.0.0.100, how does the DHCP server know which scope to use in its own zone? What prevents DHCP server from assigning ip addresses from the second zone within its own zone?
Any insight would be appreciated.
Thanks in advance.
Mark
I have two trusted zones on my firewall. Firewall rules / policies allow full communication between the trusted zones. both zones are in the same domain and both zones are physically located in the same building (on different floors).
Each zone has its own domain controller (DC), which is also the DNS server, WINS server and DHCP server.
I would like to implement redundancy with DHCP in case one of the DC's fails.
My understanding is that using DHCP relay agent will solve this problem.
What I don't understand is how each zone knows which ip addresses to use.
For instance, zone 1 uses 10.0.0.0 / 255.255.255.0; zone 2 uses 10.0.1.0 / 255.255.255.0
If the Scope of the DC in zone 1 is defined as 10.0.0.100.. .10.0.0.254 / 10.0.1.0..10.0.1.100 and scope of Dc in zone 2 is defined as 10.0.1.100..10.0.1.254 / 10.0.0.0..10.0.0.100, how does the DHCP server know which scope to use in its own zone? What prevents DHCP server from assigning ip addresses from the second zone within its own zone?
Any insight would be appreciated.
Thanks in advance.
Mark
Last Comment
Craig Beck
The DHCP servers know which scope to assign addresses from using something called the giaddr value. When a client sends a DHCP request, the router will tell the DHCP server the giaddr (the IP of the interface on the router on which the request was received) so the DHCP server will know to allocate an IP address from that range.
ASKER
OK, but what if the DHCP server does not have ot go through the router as in the case when it is giving out ip addresses to the subnet for which it is connected?
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ASKER
Thanks for your assistance.
Cheers!
Mark
Cheers!
Mark
Routers
A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.
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