I just got xfinity cable internet that is connected through a linksys wireless g router and a arris cable modem. when i do a speed test at 2wire.com, my speed is only 2.7 Mbps. I believe it should be 16. I would like to know if it is because the router is a g instead of an n.

best is leave it alone and not brick it.
but gee arris.com ask them we are no them.
YOUR UNSTATED ISP WILL NOT ALLOW THIS ASK THEM FIRST,
DO FLASH THERE MODEM, EVER,
If fact they keep it upgraded for you, talk to your ISP and listen to them. (are you dreaming of getting unpaid channel band width, no answer from me)
this?

Arris Touchstone TG1682G Wireless Telephony Cable Internet Modem Gateway Docsis 3.0 802.11a/b/g/n/ac Xfinity/Comcast (ISP Restrictions Apply)

First, are you connected via Ethernet cable or are you linking via Wi-Fi? If Wi-Fi the speed is alway slower (up to 54 Mps) If connected by Ethernet, your connection speed should read 100 Mbps. Once you have determined the connection mode and speed.unplug the wireless router and connect the computer directly to the modem. Now test the speed and see if the speed lag is still ther. If not, you have a routing /networking issue but, it it is still the same speed, it could very well be heavy traffic ( a lot of people drawing from the same local area signal., usually at specific times of the day).

Plug the ethernet net cord into the arris ethernet port. plug the other end into the router where it says "internet"

Plug a ethernet cable from one of the router ports to the computer.

First start up the arris modem, then power up the router, then start the computer.

I've tried network magic and everything thing else and I still can't get it to work.

That won't work because your old sbc wireless router 2wire gateway is also a modem. You need a plain router for Time Warner. Try Linksys router.

You can easily check your internet speed by checking it online via tis website, http://www.ip-details.com/ . It helped me to check my PC's internet speed in it.

Then you have your settings wrong, as I have the same setup for many years. The setup page of your router should be set basically default, it should be all set to auto ip and other than your dns there should not be anything else to set. I have 3 wireless and two wired devices and all of the computers .And the speed is constant,,something is wrong with your settings, if you can take a screenshot by opening the router homepage and hitting the print screen button on your keyboard, you can then hit paste on here and it will past the entire thing on here to examine

Turn everything off:
Cable modem unplug the power to the modem if it has a battery remove it.
Router unplug the power to the router
Shutdown any and all computers connected to the router

Turn everything on in this order:
Cable modem wait until all the lights are on but the internet act light
Router wait until the lights goes through it's test cycle and the internet light (wan) is on.
Boot up the computers one at a time after the first computer is fully loaded go to the next computer

Hope this helps

Terry

Your modem is capable of linking up to a router. What you do is take an ethernet cable and run it form the internet port on your modem to the internet/wan port on your router. From there you connect your pc's into the LAN ports on the router (typically labeled 1-5) if they are hardwired or you connect wirelessly with your laptop. You need to also power cycle/reset your modem when you plug your router in.

1).turn off the modem and the router.disconnected from the Internet ISP. and the computer.
2).disconnect the router from the modem.
3).turn on the modem.
4).connect the router to the modem, and turn on the router.
5).connected the computer to the router, adn turn on the computer.
if you are using wireless, waited about 5 minutes before turning it on.
goto control panel>>wireless network, and configure the wireless seting.