I need to limit access to hotspot users, so they can only use ONLY Whatsapp and Viber (so after entering username/password, hotspot users could use only Whatsapp/Viber- this is related to very narrow bandwidth).
Without hotspot I would normally do this by blocking all traffic in forward chain, except ports which are needed for Whatsapp/Viber to work. But on hotspot despite firewall filter rules, after logging in, users get full access to internet. Is there any special chain setup, so to limit access after user gets authenticated?
Many thanks in advance!