In my office, I have set up a linux machine as router and provide internet connectivity to all clients. Behind this linux router I have set up a cisco wireless router, with which I have made internet connectivity available to mobile phones of some employees in my office.
Now i want to block access to WhatsApp and other IM services (we chat, line). Is it possible to block these android applications using iptables?
iptables
by IP address. If it's to particular ports, you can block those ports. But if they use, say, regular HTTP to port 80,iptables
can't help you, because it doesn't operate at the application layer. So step one is: find out how those apps communicate.