GL-MT300N-V2 repeater/tethering problem

I have a problem with repeater/tethering/re-repeater of one mobile carrier.
I tryed:

  • 3.216 and 3.215 fully reverted firmwares
  • phone to router repeater and tethering options
  • laptop as repeater with wifi hotspot to router, laptop was connected as wifi client or over usb client to the phone
  • iptables -t mangle -I POSTROUTING 1 -j TTL --ttl-set 65 // ttl fix and unfix

Other conditions:

  • Phone with same mobile carrier as “mobile hotspot” shares internet without issues to the laptop and multiple android devices but do not work with router.
  • Same phone with other mobile carrier shares internet with router as mobile hotspot or tethering.
  • Laptop as repeater with wifi hotspot shares internet to router fine, when laptop shares not phone’s but other wifi sourse network.

Turn on ipv6 to wwan inteface.

But WG VPN can’t connect.

Can a mobile phone connect to wireguard on a carrier’s network?

Yes, phone connects to WG without any issues

Maybe it has something to do with MTU, try setting MTU to 1428.