test ssh domain name instead of IP

Anyone know how to test ssh using a domain name instead of an IP? I'm using the rclient and monitoring NAS devices that are remote and behind port forwarded DHCP home routers that have DDNS names so I have 0.0.0.0 for the host IP's in the hosts.cfg file.  I just want to test ssh to the DDNS name, not the IP.  The NAS host line in my hosts.cfg is not using a FQDN as the hostname because that gets checked as a separate host.  Here's a sample of what I have in my hosts.cfg file.

0.0.0.0         myrouter.myddns.net     # trace
0.0.0.0         NAS                 # noconn ssh "RCLIENT:cmd(ssh -T -i /home/xymon/.ssh/xymon-rclient user-7bd5c34c7476@xymon.invalid),ostype(linux)"

Signature - Kris

Thank you.


Kris Springer