I recently switched service providers and received a new router. My phone and old Windows computer connect fine, but my MacBook freezes (rainbow wheel starts going around forever after about 2 mins of being connected). MacBook connects to Wi-Fi fine at a friend's house. Another answer describes something similar being solved by switching off IPv6. However, System Preferences > Network > Wi-Fi > Advanced > Wi-Fi > TCP/IP > IPv6 is set to Automatically and all other options are greyed out. I tried to switch it off via directly entering command into Terminal, but it stayed set to Automatically.
Any suggestions as to why I cannot turn it off? Mac is running on 10.6.8 Snow Leopard.