In OpenSim references to host names , we seem to see three different
types of host address:
IP numbers
DNS names
DNS names of an underling machine
OpenSim allows the specification of host name is used for the various
(Robust) services, but still we often see it subsitituted with the
underlying IP address, and in one or two cases perhaps the underlying
canonical DNS machine name.
Our policy is always to specify a (stable) DNS alias (CNAME) for what
we call a service name e.g. ftp.aiai.ed.ac.uk, ssh.aiai.ed.ac.uk,
xmpp.aiai.ed.ac.uk, media.aiai.ed.ac.uk, and then map that to the
current host that provides that service. The underlying canonical
host name is unique in our asset data base, so cannot easily be
reused when we move to new hardware.
Hence, for our virtual worlds servers we have used aliases as follows:
virtual.aiai.ed.ac.uk for the entry grid services (Robust in our case)
virtual1.aiai.ed.ac.uk for an OpenSim region server
...
virtualN.aiai.ed.ac.uk for an OpenSim region server
If the "authority" in the external identity URL is to have any
meaning at all in our context, and stand a chance later of finding
the machine running the relevant virtual worlds services, it needs to
retain the name we give for the services in the OpenSim.ini and
Robust.HG.ini files... not try to resolve that to a current mapping
to an IP number or an underlying machine name.
I would assume similar issues would arise if dynamic server name
services are used to get a stable name for using OpenSim in some home
and NAT router network situations too.
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