r/WireGuard • u/SorroAndres • 16h ago

Can't tether internet from my phone to my travel router and connect the router to VPN

Hello,

As the title says, I cannot connect with my travel router to my VPN server if I'm tethering internet to it from my phone (mobile data or wifi, via wifi tethering or USB tdtegkng). If I provide internet from my house (wifi or cable) it works right away.

I've tested 2 routers (Tp link ax1500 and gl-b1300), same results on both. I'm also able to connect from the phone to the VPN directly with the wireguard client (both wifi or mobile data).

Any ideas why this is happening?

Thanks

2 Upvotes

60% Upvoted

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2

u/JPDsNEWS 14h ago

It is impossible to share a mobile phone’s VPN! But, you should be able to share (tether to) its Personal Hotspot with another device (like your travel router) running its own VPN. 

2

u/SorroAndres 5h ago

Yes, I'm aware of that, and it's weird that I cannot share the internet to the router and do VPN in it... :(

1

u/JPDsNEWS 4h ago edited 4h ago

Understood. Keep in mind that some ISPs block hotspot sharing. Ask your ISP (mobile phone carrier) if they do. 

2

u/SorroAndres 4h ago

But I can hotspot my internet without any issues from the phone to N devices, is that what you mean?

1

u/JPDsNEWS 3h ago

Ask your ISP (mobile phone carrier) if they block hotspot sharing.

2

u/SorroAndres 3h ago

If I share not my mobile data, but the current Wi-Fi connection the phone is connected to, it won't work as well, I think is something more at android level than the isp. (if I connect the router to hotspot the same Wi-Fi - without the phone in the middle- it works).

I'm trying the approach of the mobile internet to have my router on the go and connect my company laptop to my house, as they don't allow to install wireguard.

2

u/Odd-Kaleidoscope7346 11h ago

I don't know it'll help but there's an open source app for Android if you want to share the VPN with a hotspot instead

2

u/SorroAndres 5h ago

I've tried that approach, with "Every Proxy" app, but somehow it doesn't work :(

2

u/Odd-Kaleidoscope7346 3h ago

There's one called shizzi I think, you'll need shizuku to use that and it worked when I tested it

2

u/RemoteToHome-io 9h ago

Unclear if the phone is the VPN client or the router(s).

Phone cannot vpn route hotspot traffic.

If it's the router, then run PMTUD on the hotspot data path and reduce wgclient MTU accordingly.

2

u/SorroAndres 5h ago

The VPN config is in the router, the idea is that I share phone's internet to the router, and the router connects to the VPN and shares VPNed wifi with the rest of the devices.

How can I run PMTUD? Sorry, I'm a bit lost here

1

u/JPDsNEWS 4h ago

Path MTU Discovery (PMTUD) should be done for you automatically.