Posted 12 September 2012 - 10:19 PM
First off your network is not setup correctly. In order to use that Netgear (sidecar router) with the SMC you need to hook up....
SMC Ethernet Port 1 >> Netgear INTERNET port (should be yellow)
then as follows:
Netgear port 1 >> PC
Netgear port 2 >> PS3
Netgear port 3 >> Denon
Now you can also be having DNS errors. You need to activate Bridge mode on the SMC to prevent DNS errors and allow the netgear to be hooked up properly. You can often times call your ISP and tell them you need Bridge mode activated on your SMC Gateway or you can TEMPORARILY hook up your PC directly to Port 1 on the SMC then run IPCONFIG in command prompt and note your Default Gateway IP address. Then type that in a browser and you should be able to login. It will usually be 10.0.0.1 and the login credentials should be admin/password. Then look for a section to enable Bridge mode, then also disable the WiFi/Wireless on the SMC.
Then hook up your network as I explained above and hook up the netgear router. Now if your PC is plugged into an Ethernet port on your Netgear you should be able to login to it using 192.168.1.1 and logging in using the default credentials of admin/password or whatever you set custom. You should not have to change any DNS, DHCP, or advanced settings on the Netgear. Just configure your Wireless Network and any settings you need, and leave it at that!
Sometimes it's best to factory reset the Netgear by pushing in on the reset pinhole on the back for about 30 seconds, then power-cycle the router (unplug power for 10 sec, plug power back in) this way with the Netgear being reset you know you have a clean slate to work with and all the DNS, DHCP, and IP settings will be normal.
If you try these steps and keep dropping connection then hardwire your devices to your SMC and unplug the Netgear router and see if you still drop connection. If you do, then contact your ISP.