Top critical review
3 people found this helpful
DO NOT buy Cisco/Linksys WiFi routers if you have COMCAST internet.
on December 31, 2015
DO NOT BUY Cisco or Linksys WiFi routers if you have COMCAST internet service. There is a well-known problem with these routers on Comcast with serious speed degradation on even your hardwired devices that do not use WiFi. I bought this router in 2012 and called Comcast at least once a month about extremely slow internet service on my desktop computer. Even though I was supposed to get 75 Mbps speed, I rarely got 20 Mbps and sometimes download speed was SLOWER than upload speed (less than 10 Mbsp). When I removed the Cisco WiFi router and connected my computer to Comcast directly to cable modem, my speed miraculously jumped to 80 Mbsp. So even though I wasn't even using WiFi at the time, my computer suffered serious speed degradation because the WiFi router.
Attached are screen snapshots of the results of comcast speedtest without WiFi router on ethernet and with WiFi Router performed just minutes apart. The download speed degradation is obvious. During speed test with WiFi router connected, no WiFi devices were being used. Just the presence of the Cisco WiFi router makes this drastic difference.
The cause of the problem is bad DSCP information coming from Comcast and poor condition handling by the WMM driver on certain Linksys/Cisco routers. DSCP as received from Comcast's network is 0x08, the lowest priority possible and Cisco/Linksys routers interprets the misconfigured signal as being unimportant and is the very last to transmit. See http://www.dd-wrt.com/phpBB2/viewtopic.php?p=773658 for possible fix if you are a technology saavy.
If you want a plug and play WiFi router than does not degrade your internet speed, DO NOT BUY Cisco/Linksys routers for use on COMCAST. I am replacing my Cisco e-3200 dual-band high performance WiFi router as it is totally unusable on COMCAST.