|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).
This only restricts what value 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