I have a high end workstation that I use for cad work . it have two gigabit ethernet port . I be never able to get team to work with the adapter and lately I have to turn off ipv6 and change some other setting in order to keep from drop my connection . other computer on my network be also experience slow connection . after do some research here and elsewhere I decide to try the Motorola Surfboard sb6121 since I be run and old sb5101 . initially I just run the ethernet cable directly into a laptop from the modem . when I power it on I keep get the modem reset that people be talk about . so I try connect to the modem by typing 192.168.100.1 into my browser . at first I could not connect then I finally do and be able to look in the log on the cable modem to see what be go on . the log show it continually reboot because of a t4 timeout . so I call Comcast and within a half a hour I be up and run . once I get my router hook back up I have to restart my computer a couple of time due to some IP address conflict . since then it have be work flawlessly . I be even able to enable team my network adapter ! I check my speed on speetest.net before and after the modem . my download speed do not change much but my upload speed double ! so far I be very happy !