I can't turn off ipv6 because I use the arries supplied by twc for my maxx speeds and phone
You can turn off IPv6 in your computers.
Especially if you have Phone service, I have not heard if the 1672's ever had the IPv6 issues resolved.
That's an issue... explain further....
cable tv dvr or box?
Is it normal while performing a speed test for the HD channels to be effected during upload portion of test?