sysctl: Enable reverse-path filtering
sysctl: Enable reverse-path filtering

This prevents other computers on the same LAN from defeating firewalling
(or even reach services that only listen on localhost) by sending
packets with spoofed source- and destination-address.

hashbang/shell-etc,hashbang/shell-etc,hashbang/shell-etc,hashbang/shell-etc,hashbang/shell-etc,hashbang/shell-etc,hashbang/shell-etc,hashbang/shell-etc