[lvs]

It sounds like you just may have a few things to learn about how networking works. Comcast is selling you a coax line into your house and, if you rent their modem, giving you an ethernet interface to it. It isn't making any claims about what happens after that. They can't have control over all your networking hardware and how you configure it.

[andrewhillman]

I may have a few things to learn about how networking works. However, I was just stating the facts. A technician came out to re-configure to see if the issues of speed could be resolved. They did, and technician said... speed test is hitting ~93/120 mbps or so when wired in but the speed over wifi was much less while the specs say it is capable of doing 120 mbps without a problem. The tech actually said it isn't going to reach 120 mbps over wifi. If they don't have control, how is it they can "flip a switch" while on the phone to put you at 25 mbps or less, if you ask to downgrade? I believe when you buy 120 mbps that they are advertising they are claiming you will hit this speed if you are paying for it. I didn't see any disclaimer next to the 120 mbps saying "speed will be substantially less if using wifi router."

[phil21]

This isn't a Comcast issue. Their demarc (the divide between where service is delivered and your network) is the cable modem.

You could of course make the argument that you bought some combined cable modem/router/wifi AP box from them and it should "just work" - but you're just going to talk until you're blue in the face. Simply think of them as a pipe provider (not your IT support) and you'll be a lot happier.

What they provide is in general crap, and costing you money you can save off the monthly rental fee by providing your own equipment. This will also generally result in better performance.

I suggest buying a Surfboard 6183 (or lesser, depending on your area), and the wireless router of your choice. I recommend for simplicity sake the Apple Airport extreme or any quality 802.11n (or 802.11ac if your laptop supports it) router. Your network should look something like Cable from wall -> DOCSIS Modem -> Your wifi router. The only time you should be calling comcast is when the actual cable modem cannot obtain a lease and/or internet is in general failing.

Relying on Comcast to manage your CPE is just a plan for disaster. If your wired tests are getting 100Mbps, then the problem is on your end.

[sfont]

30 mbps is about what you would expect over 802.11g. You may want to investigate a driver issue on your PC. Another scenario that may give you poor speed over wireless is interference from neighboring access points. There are utilities available to view the channels used by access points within range. If you are on a channel that is crowded you may benefit from manually specifying the channel in your router.