This statement is mutually exclusive with update-policy and applies to master zones only.
The example shows DDNS for three zones: the first disables DDNS explicitly, the second uses an IP-based list, and the third references a key clause.
Because of this, World Wide Web (WWW) hyperlinks and Internet contact information can remain consistent and constant even if the current Internet routing arrangements change or the participant uses a mobile device.
Internet domain names are easier to remember than IP addresses such as 2.166 (IPv4) or 2001:db8:1f70::999:de48:6e8 (IPv6).
allow-update defines an address_match_list of hosts that are allowed to submit dynamic updates for master zones, and thus this statement enables Dynamic DNS.
The default in BIND 9 is to disallow updates from all hosts, that is, DDNS is disabled by default.
Your zone will be resynchronized according to the refresh interval specified in the SOA record for your zone.
If a zone transfer fails, the zone enters a "warning" state, and we will continue attempting to perform the zone transfer at the retry interval given by your SOA record until it succeeds, or the expiry timeout as provided in your SOA record is hit.
BIND (pronounced /ˈbaɪnd/), or named (/ˈneɪmdiː/), was as of 2004 the most commonly used Domain Name System (DNS) server on the Internet, and still proclaims itself to be so.You can monitor this status under the "Zone Settings" tab and also update the Primary IP or Port if necessary.Once the zone syncs, all the records you have configured on your primary server will appear in the zone in your NS1 account.On Unix-like operating systems it is the de facto standard.Originally written by four graduate students at the Computer Systems Research Group at the University of California, Berkeley (UCB), the name originates as an acronym from Berkeley Internet Name Domain.