![]() Once changes are made, the TTL can be set for a larger number in order to reduce the amount of traffic hitting the server (DNS traffic is really light, so probably not a huge deal in most environments using a Mountain Lion Server as their DNS server). If you will be making a lot of changes this value should be as low as possible (the minimum value here is 5 minutes). Additionally, the TTL (or Time To Live) can be configured, which is referenced here as the “Zone data is valid for” field. So for the above zone, the entry should be rather than (the hostname of the computer). Theoretically you could create a zone and a machine record for each host in the domain, but the right way to do things is probably going to be to create a zone for the domain name instead of the host name. This is a problem if you wish to have multiple records in your domain that point to the same host name. As you can see, a zone was created with the hostname rather than the actual domain name.
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