Progress
Installation and Configuration Guide
Version 9
for UNIX


Using UDP Broadcasting

As described earlier, UDP is a connectionless protocol. This feature allows you to configure two types of communications with a NameServer:

UDP broadcasting insulates the client and Unified Broker from having to know the exact host location of the NameServer. If there is some reason that you need to move the NameServer to a different machine in the same subnet, you can safely do it without having to change your client application or your Unified Broker configuration.

Figure 8–6 shows a client and Unified Broker using UDP broadcasting to communicate with the NameServer. Using the UDP broadcast address, 172.20.255.255, this client and Unified Broker can communicate with a NameServer running on any host in the 172.20 subnet.

Thus, you can use UDP broadcasting to support location transparency for a single NameServer. However, as Figure 8–6 implies, you can also use UDP broadcasting as the basis to support fault-tolerant NameServers using NameServer replication.


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