Using nsupdate
for dynamic DNS TSIG Updates
To update a DNS server dynamically using TSIG for authorization, run nsupdate
by doing the following:
$ nsupdate -d
> server update.dyndns.com
> zone $ZONE
> key $KEY_NAME $KEY_HMAC
> update add $HOST.$ZONE 60 A 10.0.0.1
> send
> quit
For dynamic DNS hosts, $ZONE should be the third level DNS name like myhost.dyndns.org
But it doesn't explain what $HOST is expected to be?