All - I have an interesting question .....
I have a BEFSR11 router that I have not been using for a while (this has last firmware available - from 2004). I am a Comcast customer and I am using a BEFCMU10 DOCSIS 1.1 cable modem.
I was using a Vonage / Motorola VT2442 router but I needed more flexibility with firewall rules - so I put back my BEFSR11 in place, and put the VT2442 behind the BEFSR11 (via my gigabit switch) and the only thing connected to the VT2442 is the phone. Phone works fine - no issues.
Cable modem BEFSR11 24 port gigabit switch pcs, printers, VT2442, blu-ray player, wireless access points, wii, itouch, etc.
Since I made the change - I noticed my download speeds have slowed down. I have also gone to the variety of speed test sites and what I basically see is that powerboost is not working or not there.
I tried these sites - which always show download speeds that include the effects of powerboost - but now - I always get 6mb down and 3mb up.
I have not put anything back they way it was - because I need the better / more flexible firewall rules that the BEFSR11 has and the VT2442 does not.