I have the following setup in my basement...
[wall cable jack]
[Asus RT-N66U router]
[2 ethernet cables]
[2 side by side Win7 computers]
Before, all our devices ran off the SMC; then we moved, and I added the RT-N66U
to push wireless signal through the dense walls of our new place. It worked great
for about a month, maybe six weeks...
...and then right around the new year the right-side (LAN1) computer's internet started
failing. Each time I powered it up, the system tray would show a network icon with the yellow
triangle and exclamation mark; mouseover message would be Network 3 No internet access.
I've tried lots of poking around with settings of the modem and the router (they both have
browser-based interfaces) with no luck. My cable company, which provided the SMC modem,
says signals to the modem are fine and their responsibility pretty much ends there.
Asus tech support was deeply weirded out by the "one works, one doesn't" situation, asked
a lot of Windows Control Panel questions and none about the router's settings, and finally
had me go into the Device Manager and uninstall my Realtek PCIe GBE Family Controller
(the computer's only Network Adapter device). Doing that turns the yellow triangle into a
red X, but after a reboot the controller gets reinstalled...and works, but only until the next
shutdown. To keep things working I currently uninstall the network adapter every night before
going to bed.
Any idea what the trouble might be? I want to learn a little more about LAN/WiFi technology
and so I'm curious what sorts of questions you folks will ask about this.
The SMC modem IP seems to be 192.168.0.1, and the Asus router's IP is 192.168.1.1.
As far as I know those are both default settings so it's possible-but-unlikely that I've
messed those up.
Things I've tried which didn't appear to help:
Power cycling the modem/router/computer for a minute or so each, in several
different orders (but not necessarily every order)
In the Windows Control Panel, clicking the red X for "diagnose and repair".
(Don't laugh; on one of my older computers that's actually worked a few times)
Disabling the Wi-Fi on the SMC (didn't really expect that to help, but why not
have less interference if I can)
Resetting the Asus router to factory specs
Assigning the flaky computer a static IP (this is at the fringe of my understanding so I
may have done it wrong)
Using different jacks on the Asus router (when the problem is in effect, the left side
computer seems to work in any jack from LAN1 to LAN4, and the right side computer
doesn't get better no matter which one I use)
Thanks for any suggestions!
Edited by jfahy, 17 January 2014 - 12:16 AM.