| Option | IP_FILTER_RDNS | |
| Description |
IP filter for filtering which IP addresses may be queried with the
rdns() function or
reverseDns() function.
| |
| Introduced Version | 1.37 | |
IP filter for filtering which IP addresses may be queried with
the rdns() function or
reverseDns() function.
The syntax of the IP address list is a sequence, separated by
newlines or ;, of
allow or
deny actions, along with a
CIDR block or all. An IP
address is allowed or denied by finding the first match and
applying the corresponding action. The
all value matches any
IP-address (i.e., IPv4 or IPv6).
For example, here LogScale denies RDNS queries on the
CIDR block 192.168.0.0/16
and allows all others:
IP_FILTER_RDNS=deny 192.168.0.0/16; allow all
RDNS defaults to denying lookups of reserved IP ranges. The
filter also denies additional reserved IP ranges, as specified
by the IANA, by default. Self-hosted administrators can specify
their own filters by using the environment variables
IP_FILTER_IDP, IP_FILTER_RDNS, and
IP_FILTER_RDNS_SERVER respectively.