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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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1answer
27 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 ...
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1answer
62 views

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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19 views

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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1answer
53 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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0answers
56 views

How to interpret tracert results

I've been having some inconsistency in my network connection, so I set up a script to constantly ping 1.1.1.1 and if it gets a timeout, it then runs a tracert and logs the results. This is what I ...
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52 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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1answer
99 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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1answer
61 views

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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1answer
37 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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0answers
256 views

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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2answers
39 views

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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1answer
72 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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2answers
61 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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1answer
630 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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0answers
29 views

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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2answers
660 views

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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1answer
552 views

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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0answers
69 views

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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1answer
237 views

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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1answer
2k views

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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1answer
245 views

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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1answer
6k views

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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1answer
73 views

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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1answer
154 views

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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3answers
123 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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1answer
256 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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1answer
6k views

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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1answer
2k views

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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1answer
93 views

Cable Connection drops when IPv6 activated (Cisco ASA 5500 Series)

According to Time Warner (or Spectrum as they are now called), they are ready for IPv6: https://www.timewarnercable.com/en/support/internet/topics/ipv6.html, at least for customers that have ...
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0answers
443 views

Cable Internet on Motorola Surfboard SVG6582 and dynamic IP on TL-R600VPN

I have the following devices at home: Motorola Surfboard SVG6582 and TL-R600VPN. My internet comes from a cable connection(DHCP) on Motorola device. I have two ethernet adapters on my box and I did ...
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1answer
1k views

Slow git clone speed, everything else +12Mbit/s

I'm trying to do a git clone, using ubuntu 16.04 server edition (don't ask, I needed a quick ubuntu for an openwrt build) and, while fast.com, xfinity's speedtest and speedtest.net both show 12Mbit/s ...
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3answers
88k views

Is there a reason to get DOCSIS 3.1 cable modem for one's house?

It seems that most cable modems on the market today are DOCSIS 3.0 (ex). However, "recently" (2013), DOCSIS 3.1 was announced. I'm assuming (perhaps incorrectly) that as of now, finding DOCSIS 3.1 ...
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2answers
713 views

Why does my cable modem need a MAC address?

Per title. Isn't a cable modem just working on the physical layer? Vs Ethernet. It's not my default gateway. Does the next hop at the ISP see my PCs Mac or the cable modems Mac? Both?
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1answer
170 views

TDS Cable Search: Code 0 Unknown host

When I try to use my TDS Telecome cable box to search the TV guide, it has an error: Code 0 which is says is an unknown host. This started happening after I updated some settings on my TDS ...
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1answer
1k views

DHCP Lease Expire Time (IPV4)?

Could someone tell me what this does? I assume it changes my WAN IP address? Recently somebody got my WAN IP address and for security reasons I wish to change it, should I wait till the DHCP lease ...
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1answer
2k views

How does my cable internet connection connect to the ISP? [closed]

Say I have comcast internet. I connect a modem to a coaxial wire that is connected to the wall. where does it go after that? does my coaxial cable combine with other users' coaxial before heading to a ...
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1answer
664 views

Force modem to return IPv4 address

I recently got a new cable modem and when I reset the IP it gave me an IPv6 IP address. This is a problem because it is a hassle to type in this long string of hexadecimal numbers and also PuTTY does ...
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1answer
6k views

How can you “press” a button of a webpage from the command line to restart a cable modem?

I'm trying to reboot my cable modem programmatically. I used to be able to do this by using wget: wget http://192.168.100.1/reset.htm?reset_modem=Restart+Cable+Modem However I changed my cable ...
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1answer
1k views

Super hub 3.0 unable to communicate with Chromecast

I recently got Virgin Media installed and their SuperHub 3.0 which is not able to communicate with my Chromecast, also my kodi/osmc does not show up in yatse either. This all worked fine when I was ...
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3answers
2k views

How to access cable modem dashboard from laptop, when there is router in between?

Obviously, when I connect cable modem directly to laptop using LAN cable I can access it (http://192.168.100.1). But when router is between my laptop and cable modem it's obviously not as easy as ...
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0answers
173 views

Renewing public ip address of an individual machine with cable modem

I used to have broadband internet and on each machine I could connect via broadband using the same username and password (pppoe) and every machine could have a different public ip. I now have cable ...
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0answers
44 views

Internet goes out 15-20 times per hour

I have 90 megabit Comcast Internet at my house. It comes in via coax, and my PC is hardwired to the modem-router via Ethernet cable (not wi-fi). Roughly 15-20 times per hour (every few minutes), my ...
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0answers
79 views

Reusing a docsis 2.0 modem

Comcast recently refused to activate an old docsis 2.0 modem that I had with me. I am wondering if it could be put to any use. One idea I had was to connect it to a TV through the coax, and stream ...
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1answer
141 views

managing port 25 in windows 8.1 home and cable modem [closed]

A cable modem has port 25 blocked. Two computers are on the local wifi network managed by the cable modem. One computer is a windows 8.1 machine that sends and receives email using tools like ...
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3answers
12k views

“WAN: disabled” when connecting router to cable modem

I am trying to set up internet access with a Linksys WRT54G router (DD-WRT, set as a AP) and a Motorola/Arris SB6121 cable modem which uses WOW!. The problem is that the router can’t connect to the ...
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1answer
125 views

When torrenting gets too fast, my modem becomes unresponsive?

I have a Zoom DOCSIS 3.0 modem between my Comcast internet and my wireless router. My tower that's doing the downloading is wired to the router. I've found when large torrents pick up too much speed (...
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5answers
36k views

What is the cable that runs from the cable modem to a wall outlet

I was wondering what type of cable runs from the modem to the wall outlet in my house? Is it a coaxial cable? I'm very confused by what I've read around the internet. There seem to be many variations. ...
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1answer
183 views

How far from the TV/Internet splitter can I place the cable modem?

Does my cable modem for my internet need to be connected right at the point where the cable comes into my house? In other words can I split the input cable for the TV and Internet at the entry point ...
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1answer
11k views

How to find out who is DDoSing you

So I (had) a friend who now hates me and he said he would take me offline if I blocked him on Skype. I did not believe him and I said "I don't care, do your worst". Big mistake - he found out my IP ...
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0answers
544 views

Cable modem drops connection upstream - why?

I have internet via coaxial cable (aka cable TV). The cable modem is of type Netgear CG3000. (comes from the ISP). The connection is of type DOCSIS 3.0. About a year ago the cable TV guys went ...