I have 3 Tp-link archer c7's. they are running openwrt 18.0.6 one is connected to the internet and the ither 2 are WDS clients. I am trying to setup a pptp server. I can connect to the PPTP server and I can ping the router, but I can't get on the internet. I had this working on tomato. How do I get the server to assign the clients the default gateway?