Mobile Hotspot & Proton VPN Troubleshooting

Fri, 01 May 2026 00:00:00 +0000

Mobile Hotspot & Proton VPN Troubleshooting#

A PC connected to a mobile hotspot will always display a local/private IP address (e.g., 192.168.43.x) to communicate with the phone acting as the gateway/router.
Enabling Proton VPN on the mobile device does not automatically extend the encrypted tunnel to connected hotspot devices by default. This is due to app-level vs. system-level routing, separate network interfaces, and carrier/OS restrictions.
Public IP verification and DNS leak tests are required to confirm whether hotspot traffic is actually being routed through the VPN tunnel.

Local IP vs Public IP: Local IPs are expected and required for LAN communication; privacy and security are determined by the public IP and DNS resolution, not the local address.
VPN Extension Methods:
- Enable “Always-on VPN” and “VPN passthrough” in the phone’s hotspot/tethering settings.
- Install Proton VPN directly on the PC for guaranteed tunneling, kill switch functionality, and split tunneling control.
- Use USB tethering instead of Wi-Fi hotspot if Wi-Fi passthrough fails or is blocked by the carrier.
Order of Operations: Disabling and re-enabling the hotspot after establishing the VPN connection can force the routing table to update and apply the tunnel correctly.

N/A (General networking troubleshooting pattern applicable to remote management of homelab infrastructure like Isengard (192.168.1.69) or Legolas (192.168.1.45) via mobile data).

Conversation dated 2025-12-13.
Proton VPN mobile app behavior varies significantly by OS (iOS/Android) and mobile carrier; some devices natively block VPN over hotspot.
This pattern is relevant for remote homelab administration or travel scenarios where mobile data serves as the primary internet source.

Does the specific mobile carrier or OS version in use support native VPN passthrough for hotspots without third-party apps?
Are there specific Proton VPN mobile app settings that consistently bypass carrier restrictions for tethering?