Why does an hostname of an isolated system need to be
resolved in a world
wide DNS?
It has no connection to the internet via the gw or to the tunnelling system,
so that DNS resolution will allways lead to an unreachable host.
Because there really is no relation between IP allocation and routing.
For example, back in the days when we ran a lowspeed IP packet network here and in
surrounding
countries (1987-2003 or thereabouts), it was strictly forbidden in the regulations to
have
a connection between a radio station and a public communication line.
We had thousands of stations active but none reachable from internet.
hostfiles were used instead of DNS, but the information in the hostsfiles was always
replicated to the public DNS, to indicate what addresses are allocated to whom.
Also, it would have been possible (had the software on the typical station supported it)
to
download a zonefile and use it offline.
Now that we have linking over- and to internet, we are in fact still doing that.
Our gateway downloads the zonefile from
hamradio.ucsd.edu daily, and loads it in a local
DNS
server on 44-net, only reachable from the radio side.
So even when we lose our internet connection, we can still resolve .ampr.org addresses as
they were valid just before the breakdown.
I don't think that "reachable from the internet" or "reachable from
net-44 systems that tunnel
over internet" should be a criterion for being in the .ampr.org DNS.
(this does not even consider that there may be firewalls that make it impossible to detect
for
outsiders that a system is connected, while the system itself can perfectly make outgoing
connections)
Rob