January 2001
Intermediate to advanced
288 pages
7h 52m
English
Content preview from DHCP for Windows 2000Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Fault Tolerance
Since DHCP is a critical network service, it is important for the designer to take steps that will make it fault tolerant. DHCP does not have a built-in method of fault tolerance. DHCP servers do not communicate with each other, letting the other know which addresses are allocated and whether or not it is still in operation. To create a fault tolerant DHCP service, the designer needs to manually create a fault tolerant design using scopes and/or clustering.
Splitting Scopes
Splitting scopes is a method to create DHCP fault tolerance. It is the process of creating two scopes, one on each DHCP server. The two scopes both service the same subnet, but the range of addresses is divided. If one DHCP server becomes unavailable, the remaining DHCP server continues to service DHCP client requests using its portion of the address range. So where is the address range split? That is determined by the needs of the network implementation.
The 50/50 method
The 50/50 method of splitting scopes provides both fault tolerance and load balancing for DHCP servers. In this method, 50% of the available address range is given to one scope, and the remaining 50% is given to the other scope. Typically this method is used when both DHCP servers are centrally located on the same subnet. When a DHCP client requests an IP address, the request is received by both servers and both respond with an offer. The client then accepts one of the offers (i.e., the first offer received). The selected DHCP ...
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