How to control traffic flow through a linux machine acting as router

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Hi Friends
I hope you are fine and doing great. Currently I am working on an interesting project that includes a hardware (Raspberry Pi) and a mobile application. The raspberry pi is configured as a local DNS server + DHCP server + router. It has two Network interfaces and one of them is facing the public internet. The other is acting as LAN. The android app connects to the device and list some content. These contents are coming from device itself. In between the content, I want to insert some internet recommendations based on the content information. To do so, I have to allow the internet through LAN but doing so will open up the internet to whole device. I want to allow the internet access to the application only. Is there any way this can be achieved. If not, please guide me so that a custom solution can be created. Thank you very much. Cheers.

What I have tried:

Till now I have studied a lot and looked at the manuals of DNS server, DHCP server and other articles etc. but have not found any pointers or direct solution.

Posted 11-Jul-17 3:31am

Er. Tushar Srivastava

Updated 12-Jul-17 17:34pm

v2

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barneyman · Answer 1 · 2017-07-12T17:34:00

Solution 2

look at iptables and tc

Posted 12-Jul-17 17:34pm

barneyman

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Er. Tushar Srivastava 13-Jul-17 3:09am

Have looked at it already. This solution might allow me to control the flow of traffic per device (mobile phone) connected to my Pi Server (Raspberry Pi). But I want to limit the traffic to a single application (i.e. my android application)... so that I can provide internet to my application only and other applications will not be able to use internet.