With no ability to use iptables, this is how a non-root firewall app filters outgoing traffic, whether its WiFi or mobile data.Īpps on your phone still rely on your phone's WiFi or mobile data, whether you have tethering enabled or not. This is not an external VPN service where you typically pay a fee for an account, this is just a VPN service that runs solely within your phone and is tied only to the firewall app. Instead non-root firewall apps use a really clever workaround, an internal VPN service. Non-root firewall apps, like NetGuard, don't have access to iptables since it's a system-level service.
If your phone was rooted, using a root-only firewall app like AFWall+, would rely on iptables, the firewall service that's integral to the Linux kernel.
A typical hardware firewall appliance will be monitoring both incoming and outgoing traffic, a firewall app on your phone will be primarily used to monitor only outgoing traffic, via either WiFi or mobile data. There are some fundamental basics that contrast with your assumption that apps on your phone will use your tethered hotspot for online access.
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