This section is relevant for yule only. Section heading:
Entries must be of the form:
See Section 3 on how to compute a valid entry.
The hostname must be the same name that the client
retrieves from the host on which it runs. Usually, this will
be a fully qualified hostname, no numerical address. However,
there is no method that guarantees to yield the fully
qualified hostname (it is not even guaranteed that a host has
one ...). The only way to know for sure is to set up the
client, and check whether the connection is refused by the
server with a message like
Connection attempt from unregistered
hostname In that case,
hostname is what you should use.
Problems and oddities encountered in client/server setups (like client messages from 127.0.0.1, server warnings about unknown/unresolved peer, etc. are always(at least so far) due to incorrect configuration of the DNS or the /etc/hosts file.
A surprisingly large number of hosts are not able to determine the own hostname, or reverse lookup adresses on the own local network. Don't bother asking about such problems — fix your DNS.