|Description||IP filter for filtering which DNS servers may be specified in the rdns function|
IP filter for filtering which DNS servers may be specified in the
The syntax of these list is a sequence, seperated by newlines or
deny actions, along with a CIDR
all. An IP address is
allowed or denied by finding the first match and applying the
corresponding action. The
matches any IP-address (i.e., IPv4 or IPv6).
Note that this only restricts what may be specified - if no server is specified then the system default or the one specified by RDNS_DEFAULT_SERVER will be used irrespective of whether it is blocked by this filter.
For example, here we restrict the server to
220.127.116.11 and deny all others.
IP_FILTER_RDNS_SERVER=allow 18.104.22.168; allow 22.214.171.124; deny all