use-host-decl-names flag;

If the use-host-decl-names parameter is true in a given scope, then for every host declaration within that scope, the name provided for the host declaration will be supplied to the client as its hostname. So, for example,

    group {
      use-host-decl-names on;

      host joe {
        hardware ethernet 08:00:2b:4c:29:32;
        fixed-address joe.fugue.com;
      }
    }

      host joe {
        hardware ethernet 08:00:2b:4c:29:32;
        fixed-address joe.fugue.com;
        option host-name "joe";
      }

An option host-name statement within a host declaration will override the use of the name in the host declaration.