Preventing Traffic From Outside From Reaching My WAN Interface
I got some problem here.
My WAN interface is given dhcp ip address by isp.
So the ip address of that interface is not constant.
I wish to prevent external people from pinging or reaching that WAN interface.
However, the ip address of wan interface is not constant.
How to solve this problem?
Also, is it possible to restrict traffic based on physical or virtual interfaces instead of ip addresses?