Using Easyrule to Add Firewall Rules¶
The EasyRule function found in the GUI and on the command line can be used to add firewall rules quickly.
In the GUI, this function is available in the Firewall Log view (Status > System Logs, Firewall tab). There is an icon next to the source, which will add the source to a blocking rule in an alias. There is an icon next to the destination to add a pass rule from the source of that log entry to the destination IP address and port.
There is a command line program that handles the same functionality. It is called “easyrule” and can be run from the shell like so:
: easyrule usage: Blocking only requires an IP to block easyrule block <interface> <source IP> Passing requires more detail, as it must be as specific as possible. The destination port is optional if you're using a protocol without a port (e.g. ICMP, OSPF, etc). easyrule pass <interface> <protocol> <source IP> <destination ip> [destination port] Block example: easyrule block wan 188.8.131.52 Pass example (protocol with port): easyrule pass wan tcp 184.108.40.206 192.168.0.4 80 Pass example (protocol without port): easyrule pass wan icmp 220.127.116.11 192.168.0.4
The source code of those scripts can be adapted for adding firewall rules in other ways, but that is left as an exercise for the reader.