Hi dude, where did you get the beta firmware and what's your version of your OS?

Hi dude, Which version are you using of R480T+?

You mean the Online Detection right? If you choose auto mode, it will be like what you said. Because it will detect his own gateway, if the cable still connect, it will shows online. You can change...

You should put 255.255.255.248 in the subnet mask.

http://www.tp-link.com/en/faq-827.html Will this be helpful?

Maybe you can give a screen shot of your config about the Online Detection, I can help you to check.