How are you connecting to the 628? Wired or Wireless?
What wireless modes are you running? Mixed? Single?
At the moment I am only connecting via a Wired connection. I have not set up any Wireless connections but when I do I plan to use both bands.
Make sure that Always On is enabled under PPPoE settings.
Ensure Advanced DNS Services are disabled.
Ensure DNS addresses are being filled in under Setup/Internet/Manual.
Ensure DNS Relay is enabled under setup/networking.
Might try setting reserved IP addresses on the router for your devices.
Set up Firewall for Endpoint Independent for TCP and UDP.
Turn off QoS in mean time.
I did the best that I can.
Before I got started I changed the password in the 2Wire DSL Modem just to be sure I had it right.
Then I did my drill, but did it all manually.
I did the internet page first and noticed that as soon as I set the password in the router and saved it that the Local Network light went out on the DSL Modem. It did not come back until I switched back to the old Linksys router.
The next few posts are screenshots from my setup. I can say what I have done, but a picture makes it clearer.
Note: I am active in another forum that uses [SPOILER](something)[/SPOILER] tags, which hides tghe something between the two tags. I had planned to put these images inside those tags, but this forum does not support them.