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The ways WINS works on a network is determined by the node type set for a client. The node type defines how name services work. WINS clients can be one of four node types:
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B-Node (Broadcast Node)
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Broadcast messages are used to register and resolve names. Computers that need to resolve a name broadcast a message to every host on the local network, requesting the IP address for a computer name. Best for small networks. WINS servers are used to register and resolve computer names to Internet Protocol (IP) addresses. Computers that need to resolve a name send a query message to the server and the server responds. Best if you want to eliminate broadcasts. In some cases, however, resources might not be seen as available if the WINS server isn t updated by the computer providing the resources. A combination of B-Node and P-Node. WINS clients first try to use broadcasts for name resolution. If this fails, the clients then try using a WINS server. Still means a lot of broadcast traffic. A combination of B-Node and P-Node. WINS clients first try to use a WINS server for name resolution. If this fails, the clients then try broadcasts for name resolution. Best for most networks that use WINS servers because it reduces broadcast traffic.
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P-Node (Peer-to-Peer Node)
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Tip Small networks might not need a WINS server On a small network without subnets and a limited number of computers, WINS clients can rely on broadcasts for name resolution. In this case, it isn t necessary to set up a WINS server.
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Part 6: Managing Windows Server 2003 Networking and Print Services
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Implementing and Maintaining WINS
WINS Name Registration and Cache
WINS maintains a database of name-to-IP-address mappings automatically. Whenever a computer or resource becomes available, it registers itself with the WINS server to tell the server the name and IP address it is using. As long as no other computer or resource on the network is using that name, the WINS server accepts the request and registers the computer or resource in its database. Name registration isn t permanent. Each name that is registered has a lease period associated with it, which is called its Time to Live (TTL). A WINS client must reregister its name before the lease expires and attempts to do so when 50 percent of the lease period has elapsed or when it is restarted. If a WINS client doesn t reregister its name, the lease expires and is marked for deletion from the WINS database. During normal shutdown, a WINS client will send a message to the WINS server requesting release of the registration. The WINS server then marks the record for deletion. Whenever records are marked for deletion, they are said to be tombstoned. As with DNS clients, WINS clients maintain a cache of NetBIOS names that have been looked up. WINS cache, however, is designed to hold only names looked up recently. By default, names are cached for up to 10 minutes and the cache is limited to 16 names. You can view entries in the NetBIOS cache by typing nbtstat-c at the command prompt.
WINS Implementation Details and New Features
On most networks that use WINS, you ll want to configure at least two WINS servers for name resolution. When there are multiple WINS servers, you can configure replication of database entries between the servers. Replication allows for fault tolerance and load balancing by ensuring that entries in one server s database are replicated to its replication partners. These replication partners can then handle renewal and release requests from clients as if they held the primary registration in the first place. For Windows Server 2003, WINS has several important updates, including the following:
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