Bind dns slave not updating

05-May-2020 11:40

While on its face this may seem an excessively friendly default, DNS data is essentially public (that's why its there) and the bad guys can get all of it anyway.However if the thought of anyone being able to transfer your precious zone file is repugnant, or (and this is far more significant) you are concerned about possible Do S attack initiated by XFER requests, then use the following policy.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.Opinion is divided as to whether this is good practice, and it is not unusual for a more restrictive policy to be imposed.The servers that are allowed to perform transfers are specified in an flag will be present, meaning that the answer is authoritative.This statement is mutually exclusive with update-policy and applies to master zones only.

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This can be done for individual zones: The setting for a zone takes precedence, therefore if you use the latter method then you should check that it has not been overridden.Masters must be specified as IP addresses, not as domain names, however it is possible to define a ‘masters list’ containing the required addresses which can then be referred to symbolically (see below).

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