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CHAPTER 3 Planning a Host Resolution Strategy
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5 The client checks the Lmhosts file for a match to the query if it is configured to use the Lmhosts file and the file exists 6 The client tries the Hosts file and then a DNS server
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Windows 2000, Windows Server 2003, and Windows XP computers will use DNS to resolve the hostname first if the name is longer than 15 characters or contains a period (which signifies a DNS domain) Resolution in other modes follows the same basic sequence In fact, ignoring the specifics of the WINS system, you can apply a more general sequence of name resolution using both WINS and DNS and the two host files like this: 1 Determine if the name is longer than 15 characters or if it contains periods () If so, query DNS for the name 2 Determine if the name is stored in the remote name cache at the client 3 Contact and try configured WINS servers to attempt to resolve the name using WINS 4 Use local IP broadcasts to the subnet 5 Check an Lmhosts file to see if Enable LMHOSTS Lookup is enabled in the Internet Protocol (TCP/IP) properties for the connection 6 Check a Hosts file 7 Query a DNS server If you are using WINS, you should either ensure that your WINS servers are available (see the next section, Plan a WINS Replication Strategy ), or use an Lmhosts file for resolving your key servers and machines within your network
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Plan a WINS Replication Strategy
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One difference between WINS and DNS is that because WINS information can be replicated across servers and individual machines can register with any valid WINS server, the information will be exchanged between WINS servers within the replication group A single WINS server is actually able to support a comparatively high number of clients for registration and resolving purposes However, for redundancy and fault tolerance reasons, it can be a good idea to install more than one WINS server so that the WINS service is always available
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WINS replication can be used in this situation as the replication syncs between the two servers and both servers can update their local copy before exchanging the updated information with the other
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Replication Types
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When you set up replication, the information is exchanged between replication partners in one of three ways: push, pull, or push and pull:
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Pull partners Request updates from a replication partner at specific intervals, by default every 30 minutes This type of partner is ideal where you want a server to act as an additional resolving server without providing registration services Pull partners can also be used where the WINS database needs to replicated across a slow network link The downside is that the exchange interval can mean that WINS services are not copied in time for them to be used Push partners Notify replication partners when the number of changes to the local database exceeds a given figure Push partners are best used on fast networks where the consistency of the database is paramount because the updates can be sent almost as soon as the local database is updated Push/pull partners Use a combination of the two systems, automatically requesting updates from replication partners at given intervals and pushing updates as required
All types of replication can use the persistent connections (enabled by default) that maintain the connection between WINS servers, which makes synchronization faster by removing the need to open the connection each time
Exam Tip
Except in special circumstances, you can generally use push/pull technology to keep two servers synchronized with each other
Automatic Partner Discovery
Automatic partner discovery allows WINS servers to automatically discover their replication partners by using the multicast address 2240124 to broadcast their existence on the network All WINS servers discovered with this method are set to push/pull mode with a pull interval of two hours
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