Hi,

I think, the default is to use FQDN. It is defined in xymonserver.cfg:

General settings

FQDN="TRUE" # Use fully-qualified hostnames internally. Keep it TRUE unless you know better.

So you should never have a FQDN in your hosts.cfg

So what if you have www.internal.example.com <http://www.in.telstra.com> and www.example.com <http://www.example.com>? It seems to me that the primary attribute for a hostname is for it to be unique. On the Internet, that generally means FQDN.

Regards, Dirk