Weird issues with Modem and ethernet

Alanek2002

Reputable
Feb 25, 2015
6
0
4,510
So, I have an... interesting... issue.

I had a nice and clean setup for my network, an Ethernet cable going to my router, and then two/three cables coming off of that, as well as 6ish wireless connections.

Due to issues with the printer loosing connection due to distance, we've moved the router about a 60 feet away from where it was. So we now have two Ethernet cables plugged into our modem, one to the router, one to my Desktop. Here is where the issues start.

After restarting the modem, the first cable to request internet gets it. So If I restart it while my computer is on, but my router is not, internet shall work for my computer. If i then turn on the router, it won't work for the router or any connected devices. If I turn my computer off, it still won't work for the router unless I restart it with my computer off. Then it will work for the router, but not my computer.

I've tried this with all of the Ethernet ports on the back of the modem. I've googled, but I never found anybody with quite the same problem. (Probably because most people don't have a router 60 ft from the modem and just plug straight into the router.)

Theoretically, I could buy a splitter/hub, so that I only use one port on the modem, but I don't know if that will help.

Modem is : Arris TG1682
Router is : Netgear WNR 2000
Tech specs requested in the stickied thread:
WiFi: Gigabyte GC-WB867D-I PCI-Express x1 802.11a/b/g/n/ac Wi-Fi Adapter
Motherboard: ASRock Z97M Pro4 Micro ATX LGA1150 Motherboard
PSU: EVGA supernova G2
OS: Windows 10
Driver version.... ?

Help.
 
Solution
That is because you have things wired wrong.

Your ISP only provides you with 1 IP address. Thus any devices connected to the modem BEFORE a router are sharing that 1 IP address. Thus as you have seen the first device to power on gets internet connection and the others dont.

The primary job of the router is to provide unique addresses to all of the devices plugged into it and then "bridge' those to the single internet connection.


Its hard to make a proper recommendation wihtout a good visual of floorplan/wiring.

Ideally if you can run 1 additional cable from router back to where your old wires were at, then you can put an ethernet switch there (not a hub)
30ro7r8.jpg
That is because you have things wired wrong.

Your ISP only provides you with 1 IP address. Thus any devices connected to the modem BEFORE a router are sharing that 1 IP address. Thus as you have seen the first device to power on gets internet connection and the others dont.

The primary job of the router is to provide unique addresses to all of the devices plugged into it and then "bridge' those to the single internet connection.


Its hard to make a proper recommendation wihtout a good visual of floorplan/wiring.

Ideally if you can run 1 additional cable from router back to where your old wires were at, then you can put an ethernet switch there (not a hub)
30ro7r8.jpg
 
Solution

Alanek2002

Reputable
Feb 25, 2015
6
0
4,510

Thank you, this clears it up.

... but not why the modem has 4 ports when it can only use one. o_O