is_in_subnet()¶

Purpose¶

is_in_subnet(ip, cidr)

Checks if the provided IP address matches the specified CIDR subnet. Returns 1 if the IP is in the subnet, 0 otherwise.

ip - The IP address to check (IPv4 or IPv6 string).
cidr - The subnet in CIDR notation (e.g., “192.168.1.0/24” or “2001:db8::/32”).

1 - If the IP address is valid and belongs to the subnet.
0 - If the IP address is valid but does not belong to the subnet, or if inputs are invalid.

if is_in_subnet($fromhost-ip, "192.168.0.0/16") then {
   action(type="omfile" file="/var/log/local_net.log")
}

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