When setting up DNS, in general you need to accomplish three things. First, you need to set up the master server for your zone. After that, in some situations you need reversed DNS. When that's in place, you basically have a working domain. As the third and last step, you should increase the availability of that domain by configuring at least one slave server. You can read how to do all this in the next three sections.
Note In some situations, reversed DNS is required. This is the case for all services that need to be able to look up the host name of a given IP address. If, however, you don't have such a service, it may be a good idea to skip reversed DNS completely. Looking up host names causes a relatively heavy performance hit.
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