I can't access my modem's web interface?

Question

So I've gone through hell these past few weeks attempting to access my modem's web interface with zero results. I used to be able to access my modem's web interface but I now can't for whatever reason. I've reset it, rebooted it, and even replaced it. I've searched all over the internet for answers and even talked to spectrum with no luck. I can easily access my router's web interface but that does me no good as I need to open the ports I want to open on my router and my modem. The modem I have is an Arris TG1682g and I've tried 192.168.0.1 (default IP on the box) and 10.0.0.1 (recommended all over the internet) with no luck whatsoever.

Answer 1

The reason you can't reach the modem, is because the IP address of the modem is on the same network as your LAN, but isn't connected to the LAN (its connected to the WAN). The easy fix, if you can't change your modem IP, is to change your LAN IP range. Use something like 192.168.0.0/255 instead of 192.168.1.0/255. Basically change your router IP to 192.168.0.1 and your DHCP server to serve IPs in the 192.168.0.X range.



Detailed Explaination



Right now you actually have 3 different networks: Network Diagram



As you can see in the image, the LAN and modem are on the same network, but separated by the router. The reason this is a problem is because when you send a packet to 192.168.1.1 from your computer on the LAN, the netmask (255.255.255.0) says that any IP from 192.168.1.0-192.168.1.255 should be on the LAN, so it performs an ARP query to find the MAC address of the machine with that address, but no machine on the network has that address, so it fails.



However, if they are different networks, they packet will always get sent to the default gateway(the router) which will then send it out the WAN port since it not destined for any of the devices on the LAN.

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Answer 2

If you are not using the actual router IP address, but using a URL like



http://routerlogin.net



(some routers use a different URL), then this may not work if you are not getting the DNS address in your device set up automatically by the router.



If you use a URL to access the router, then your computer will use a DNS server to look up the actual IP address. Your router's DNS server will recognise the string and return its own IP address. However, if you have used a different DNS server such as 8.8.8.8 provided by Google, that DNS server will have no knowledge of the IP address of your router, and you will not be able to reach the router.



If this is your problem, then either use the router''s IP address instead of a URL; set the device's DNS address to the router's address; or set the device to get its address including the DNS using DHCP.



I hope this helps.

Answer 3

For your type router defaults addresse are 10.0.0.1, 192.168.100.1 or 192.168.1.1

Answer 4

You really do need to put the Arris in BRIDGE MODE! Then all port forwarding will be done at your router. The Arris is a router/modem.. it can be set to pass the public IP to the router you have behind it when the Arris is set to BRIDGE! You will find, the computer you are using is on a different IP range than what the Arris is using, you can not address the Arris because you are not on the network it uses. Plug directly into the Arris, then you can address the modem/router.. Go into the settings and select BRIDGE MODE rather than router etc.



If you are going to use port forwarding, you do not want two routers to contend with in the system!

Answer 5

Have you tried plugging in directly to the modem from your computer (not going through the router?). That would be my guess. If you rent your modem, they may have turned off that ability with an update.

Answer 6

okay, first of all, to properly do this, you should DISABLE any wifi, routing and DHCP function on the modem, and just have it pass the internet signal on to the router. having 2 devices routing internet causes problems.

then set up port forwarding on your router.

to access your modem's web interface you need it directly to the computer via ethernet. then check your Gateway ind command prompt by typing ipconfig. this is the address of your modem. check. with your ISP for the user/pass combo...