You cannot. The router AT&T provides authenticates the connection. What you could do is run your own router with a copied MAC that forwards the auth and keep a

You cannot. The router AT&T provides authenticates the connection. What you could do is run your own router with a copied MAC that forwards the auth and keep alive packets. Here is a guide for OpenWRT. https://pyther.net/2020/05/03/bypass-att-gateway-openwrt.html https://pyther.net/2020/05/03/bypass-att-gateway-openwrt.htm...