Questions tagged [cable-modem]

A type of network bridge that provides bi-directional data communication via radio frequency channels on hybrid fibre-coaxial (HFC aka CATV) infrastructure.

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3 answers
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Does a cable modem have its own MAC and IP addresses or is it just passing out your router's MAC address and IP address?

Please correct me if I’m wrong: I have a SOHO router at home that is plugged to my cable modem. My idea is that a MODEM is just modulating the digital signal coming out of my router into the analog ...
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Port forwarding issues for MC server, WAN IP gets ports forwarded , but LAN IP for the home server does not

- Router- TP link ac4000 Archer A20 ver 3.6 - Modem Hitron model EN2251 I can get a new modem and router if needed I'm just trying to make a home server , that can also host a Minecraft server for the ...
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2 answers
60 views

Cable modem + 300 ft of Coax?

I'm trying to get cable internet to a house in the woods. However, my ISP's connection is about 300 ft away. I want to run a coaxial cable from there to the house, but due to budget constraints, I can'...
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Admin password on Arris Surfboard SVG2482AC does not work even after reset

From the title .. I'm not sure where to go with this problem.. I put in the default user of admin and the password that is printed on the modem. I get this: What can be done now ?
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1 answer
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Router DCHP fails when connected to highspeed internet

Last Tuesday I upgraded my internet from Spectrum Communications from their basic package to a residential package that gets between 100Mbs and 200Mbs. The basic package maxes out at about 37Mbs (...
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1 answer
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frequency of connector/splitter for RG-6 cable internet connection

Moved into a new place, and the cable run under the house was split a bunch of different times. So I ran a new drop straight from the outlet I want to the box outside, it's for the internet and is the ...
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1 answer
1k views

Convert Cable Modem/Wifi Router to just a Wifi Router

Looking at buying a cheap Cable Modem/Wifi Gateway combo while I wait for my ISP to get faster speeds, at which point I would buy a pricier DOCSIS 3.1 cable modem. When that eventually happens, will ...
1 vote
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DOCSIS Upload speed [closed]

If I'm only interested in upload speed and my cable provider's plan offers a maximum upload speed of 35Mbps, is there any reason why I'd need a pricier 16x8 modem over a cheaper 8x4 modem? Details: My ...
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Network issues - only Chrome's google search works, resetting modem fixes the issue

Summary I have a regular problem where my internet stops working on almost all websites, whether on wifi or wired to the router or wired straight to the modem. However, Chrome's Google search still ...
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1 answer
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Basic Ethernet Home Network Cabling

I am trying to set the Ethernet ports around my parents house (CAT 5e) but I am a bit confused as to how to go about it. They’re currently just using wifi with a basic xfinity router/modem. I have ...
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Internet connection partly not working: Some websites do not load

I am on an internet over cable connection. Cable modem is a combined device including router and wlan hotspot. Since yesterday I experience strange network behaviour - nothing changed on any settings ...
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1 vote
1 answer
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Does DOCSIS performance degrade if you have locked channels that are "bad"? Is there some way to disable "bad" channels?

I have been having bandwidth problems on a home cable internet line. The ISP seems unable/unwilling to assist in a timely fashion, so I have been reading specs on DOCSIS and such to see if I can at ...
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1 answer
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Cable modem suddenly has connectivity problems, captured log: what do these errors indicate?

Normally our ISP and Internet service works very well and we get speeds up 115MBPS. Today everything was going great, then suddenly we lose connectivity. The wireless router is fine. I log into ...
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1 vote
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Why is my home network so slow?

Update 1 posted below. At home we have a cable internet service (Comcast/Xfinity). I have an owned Netgear CM400 Cable Modem. The modem is connected to a wireless router to provide both wired and ...
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-2 votes
1 answer
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Sharing Cable with multiple devices

Comcast has wired our farm so that we have two taps coming off of the telephone pole. One runs to the barn and one runs to the house. While we need WiFi access in the barn to handle security camera ...
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1 answer
979 views

How can I determine whether my Internet is failing because of my modem, router, or ISP? [closed]

I have one of the worst ISPs (Comcast) ... but they have a monopoly and I'm stuck with them. Things do work fine most of the time, but far too often my internet will just cut out for no reason. ...
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How to Tell if Something Converts Wired into Wifi Connection

I am trying to figure out if the following product converts a Regular Cable Modem with No Wifi to a Wifi Connection. It does not specify. What specs can one use, so I can learn myself? TP-Link AC750 ...
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Modem online, No internet

My modem is online but I do not have internet, neither WiFi nor cable. My internet service provider says that it sees the modem online, and that everything is fine with the settings and signal ...
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D-Link Reset firmware to factory settings firmware failed

My Device is D-Link DIR 850L B1 firmware Et-1.02 was upgraded to DIR850LB1_FW220WWb03 successfully, after upgrade the configuration were also reset. I have backup of saved settings file config.DAT ...
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1 answer
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Site reachable using cell phone LTE but not home cable connection

I have a website that is accessible when I use my cell phone using the cell service LTE for the internet. However, my home cable connection can't connect to the same website. When I switch from LTE to ...
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Cisco EPC3010 suddenly stopped working; stuck on "scanning". ISP claims everything is fine

A few days ago, my internet connection suddenly dropped. I was not using it at the time, nor have I made any changes to my network recently. My computer is connected directly to the modem using an ...
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Can't find login page for cable modem

I want to double check that the password of my cable modem is not the default. I have an ARRIS TM1602. If I go to 192.168.100.1, this appears to be the cable modem management URL. There is no option ...
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1 vote
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Is my cable modem/router flakey, or is it the upstream connection?

Our internet connection goes down on an average of twice an hour. There doesn't seem to be a consistency about when. We have a Motorola MG7540 Cable Modem/Router (at 10.0.0.1) that provides both ...
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1 answer
275 views

Is there a secure way to provide outside access to a computer inside a cablemodem LAN?

I've got a home LAN, behind a Comcast cablemodem and router. I would like to be able to access one of my machines from outside (via screen sharing or remote logon) but am wary of opening any potential ...
3 votes
1 answer
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DNS Suffix Explanation

First question here. I had a problem with my Internet provider's modem, model Sagecom F@st 3890v3. The problem was that it pointed the device DNS Suffix to utopia.net Comcast had this problem (utopia....
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How can HDMI and wired LAN Ports not work on a cable modem, but WIFI and Composite video work?

After a recent lighting storm, my computer's wired internet connection and my local network which both run off my cable modem/WIFI router stopped working. There's a blinking amber light and the ...
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1 answer
453 views

Modem/Router combo keeps switching to Bridged mode

I have a SBG6700-AC modem/router combo that was purchased at Best Buy a couple of years ago. WiFi routing was enabled out of the box and worked fine until I hooked up the modem yesterday at a new ...
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122 views

No internet access when modem reboots

I have a cable modem (A) given by my ISP (which has only 1 RJ 45 Ethernet port along with the ISPs cable input port) a modem+router (B) and another router (C). A lan cable connects A to B, another ...
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1 answer
689 views

How to setup home network with two routers (or "to not waste superb WiFi router in basement")

I have the crazy plan to rewire my home network. Well currently it is a rather simple set up I guess, that I'd like to complicate :-) to get rid of my (not very stable) powerline adapters and to ...
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What is the difference between docsis speed and internet plan speed

I recently purchased a cable modem which is advertising two different numbers. I didn't notice that it had two different numbers until my Internet speed test results were horrendous. Can anyone tell ...
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1 answer
593 views

Is it my modem or my ISP?

I am having internet connection problems. From tracert 8.8.8.8, the connection to modem is always immediate, but the router next (getting out of the modem) fails easily (Request timed out). It ...
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IP address conflict according to Linksys

Apparently my Arris SB8200 Modem is causing an ip address conflict with my Linksys AC2200 Velop Mesh Router. The web gui address for the SB8200 is 192.168.100.1 and Velop is 192.168.1.1. According to ...
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2 answers
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What can take out a cable modem? [closed]

I have replaced my cable modem 4 times in the last 6 months. The last one only lasted a week. I don't have to pay for it (I just take it back to the cable company for replacement), but it is a ...
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1 answer
1k views

Wowway internet service drops connection frequently?

Our Wowway internet service keeps dropping out and I looked at the modem logs and see messages like this: Sep 06 2018 20:45:01 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=...
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1 vote
2 answers
254 views

Will a higher speed cable modem on a slower service tier running cooler than a slower modem on the same tier?

I think my cable modem is dying. It runs hot and lately my service has random disconnects that are typically resolved with a simple power cycle of the modem. It's a SB6121--a plain cable modem not a ...
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2 votes
1 answer
2k views

How can I test my internet connection's stability and detect very short sub-second outages?

I'm experiencing a problem with my cable internet connection where it will occasionally drop out for less than a second. It's barely noticeable most of the time, but when downloading large files, ...
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1 answer
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Does any of this cable connection data indicate an error with the incoming connection?

Can someone tell me if the data from my cable modem seems to indicate a problem with the incoming connection? Do the Frequency, Power and SNR values seem like they are in the expected range for a ...
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Any ideas why my wifi is slower than it is suppose to be?

I have a 300mbit/s internet connection and I actually get bit faster since I download from steam around 40Mb/s when using my desktop computer and ethernet. My problem is that when I use my laptop and ...
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1 answer
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Configuring a WAN port on Comtrend AR-5381u router for use with cable modem

First time posting to a forum, this is all very new to me, I hope I do okay. I normally find solutions to my own problems by searching, but I may have met my match. I know very little about networking ...
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Static IP is only available from a specific router, but it needs to be available from the Internet

I have a cable modem that has a 6 static IPs. One is the gateway, and the other 5 can be used for whatever I want. The cable modem has 4 jacks on the back, and I plug 3 routers into those jacks. 2 of ...
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1 answer
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ADSL and Cable modem connected to same SWITCH?

I have had ADSL and IPTV using the ADSL connection for quite long time. Recently I was offered much faster internet connection using cable modem. I Have all my devices (IPTV box, ps4, Desktop PC... ...
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1 answer
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Netgear Nighthawk R6700v2 router can't connect to the Internet via a Comcast/Xfinity cable modem

Note: I'm offering this self-answered question hoping it will spare others similar troubles. I don't know what other Netgear router models are affected. Prerequisites: The Comcast/Xfinity cable ...
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1 answer
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connect switch to cable modem

Can I run a splitter(switch) from Cable modem to switch to router? I want to place my wireless router in a different room from my modem but connect my desktop and printer in the same room as my modem....
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1 answer
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ISP modem/router, how do I enable Bridged Mode and use my own router?

I have an Arris TG1672G supplied by my ISP. I have called and asked if I can use my own modem (a Surfboard for example) and they told me I can't use my own device. Apparently we aren't renting it, we ...
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Connect to PCs on different network

Setup: Modem has build it router that set to 192.168.0.1/255.255.255.0 to that modem is connected another router with IP 192.168.1.1/255.255.255.0 (I can't access router's config, so not sure how it's ...
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1 answer
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How does a cable modem work

My ISP told me I had to wait some months to upgrade my network plan so I unsubscribed and resubscribed with my brother's name. They came and changed my cable modem. It's really bad and I wanted to ...
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3 answers
276 views

Can I share a CableModem connection via a Gigabit Switch?

Can I configure my network this way? It's not working (only one device has internet access) So I was thinking that I needed to have an actual router in there to assign IP addresses to each device. ...
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1 vote
1 answer
318 views

Tplink slows down internet

When I introduce a TL-WR841N Router between my PC and Cable modem, the internet speed drops by 50%. Cable Modem* ----- PC 200 Mbps (via speedtest.net) Cable Modem* ----Tplink- PC 96 Mbps (...
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1 vote
1 answer
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No internet connection because of "error 797 modem was not found"

I have Windows 7 Ultimate with a PPPOE over ethernet connection, RJ cable directly plugged to my motherboard. When i try to connect the error occurs. To solve the proble i tried to: Delete and ...
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1 answer
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Can single incoming Coaxial Cable carry signals for 2 separate services; Cable Modem ISP (DOCSIS 3.x) & Digital Cable TV Set top Box STB (DVB-C)?

Can single incoming Coaxial Cable carry signals for 2 separate services; Cable Modem ISP (DOCSIS 3.x) & Digital Cable TV Set top Box STB (DVB-C)? Single incoming Coaxial Cable with Joiner/ ...
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