Questions tagged [modem]

A device for sending a digital signal down an analog line

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NetComm modem reports no internet connection despite the PC still has internet access

I switched to use a NetComm modem. Since I use it purely as a modem, I turned off its Wi-Fi to avoid interference with my other Wi-Fi access point. Here is the web image: I don't understand why ...
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Router restarts after big git push or big file upload

My problem is that modem (Modem / router #1 presented below) restarts itself, when I make git push with a lot of files (I'm not sure how big the push must be to break the connection, but smaller ...
Bartłomiej Zieliński's user avatar
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I am trying to login to my Netcomm Router/Modem and the password field is changing to base64 before it sends

I was recently seeing how the property of a family member faces out onto the internet and came across an issue in the netcomm login page. when I enter a password it changes it to Base64 before it ...
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ModemManager debug mode

I have a problem with modem connection on 2 from 4 of my identical laptops. I found in syslog that there is difference in this part: working laptop ModemManager[749]: <debug> [1563287931....
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Replacing adsl with hotspot

I have just bought a 4G/3G wifi hotspot (D-Link DWR-932) and I would like to use it as a backup to my home ADSL connection. I have a rather elaborate home LAN. My router is a TP-Link TL-R480T+ which ...
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Trouble getting a data connection on a Telit LEU910C1-EU modem

I'm trying to connect a Telit LEU910C1-EU modem to get a data connection (over LTE). The module is used via a CM3, the modem itself is plugged into a usb hub. While tinkering around I got the ...
Sahib's user avatar
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Cannot connect to a specific Minecraft server using router/modem

I'm having trouble connecting to one specific Minecraft server through my home internet. I've tried to connect using 2 separate PC's (one using a wired connection and the other wireless) with no luck. ...
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Which MAC address does my ISP need?

For my new network I want to use a Vigor 130 as modem in bridging mode and an OPNsense appliance behind that. The OPNsense will connect to the Internet. My ISP uses IPoE/DHCP for Internet access and ...
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Modem without bridge mode and personal router

I recently switched ISPs and received a new modem. Back with my old ISP, I had three public IPs and my modem was able to switch to bridge mode. My previous setup was like this. Modem -> Router (...
mariu5's user avatar
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Does the Nighthawk M1 support IPv6?

I've searched for hours for a good answer on whether the Nighthawk M1 (MR1100-100EUS) supports IPv6 but found no definite answer. Some say it does support it while some say it doesn't. Most people are ...
Mikael Dúi Bolinder's user avatar
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Repeated "Wrong password for user root" in WiMAX device log

I was looking at the log for Sagemcom Gigaset SX686 device and noticed repeated entries that look like this: Jun 2 14:25:47 War <EVENT> scm: 048-00-00 Unknown user tried to connect via SSH ...
user1044501's user avatar
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Modem/router provided by ISP can only filter 6 MACs... what are some alternative implementations?

My ISP provided ZyXEL C3000Z router. I'm trying to configure MAC filtering -- to permit only whitelisted addresses to connect. After I added my 6th device (4 laptops -- 2 work issued, 2 personal, ...
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Do you need to do port forward when a PC is plugged directly in to a very basic cable modem?

If I plug my very basic cable modem directly in to a desktop computer, would it be necessary to configure port settings, or should it work if my firewall is off? I'm looking to connect to a specific ...
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Huawei E3372 Mode_Switch Issue

I am trying to switch mode of Modem so that i can access internet on Raspberry Pi. On running lsusb: lsusb Bus 001 Device 005: ID 046d:c534 Logitech, Inc. Unifying Receiver Bus 001 Device 022: ID ...
user3622654's user avatar
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1 answer
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Will I run double-NAT with this configuration?

My ISP has provided me with a VDSL2 router/modem with VoIP functionallity (Technicolor TG788V v3). Problem is that I want to connect my own router to the network. I contacted my ISP and they told me ...
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Using the same private network address ranges on all routers

My setup: 2 desktops (Desk1 and Desk2) and 1 laptop (Laptop1). Both desktops are plugged into the back of my AT&T BGW210-700 modem/router. I also have a Linksys EA9300 wireless router ...
MrPuzzler's user avatar
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1 answer
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Upgraded internet speed; some computers retain old connection speed

I should start by describing my computer setup. I have 2 desktop computers (call them D1 and D2) running Windows 7 and a laptop (call it L1) running Windows 10. D1 and D2 are connected by CAT5e to ...
MrPuzzler's user avatar
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28 votes
9 answers
13k views

How can Internet speed be 10 times slower without a router than when using the same connection with a router?

I am trying to figure out what is the realistic "speed of service" that my Internet company provides to my house. Here are the test that I am running: Internet ↔ modem ↔ wireless router ↔ laptop: ...
AlexeiOst's user avatar
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Different public IP address when connected directly to modem and behind router [closed]

I am trying to get whitelisted for my work to access an internal app from the web, but I'm getting a timeout error. Our sys admin says that I am whitelisted and should be able to access the app. I ...
Christopher Carlisle's user avatar
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1 answer
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After factory resetting and rebooting my modem, I still can't log in to my modem with the default username and password

For countless hours I've been trying to figure out the solution for a problem I've been having. I clicked on an option for my Remote Access panel in my Router (My router model is Sagemcom F@st5260 ...
Zach's user avatar
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2 votes
2 answers
6k views

How does a NAT behind a NAT work (router's NAT and ISP's NAT)?

I'm using a modem-router and in certain cases am also behind an ISP NAT. How does a NAT (the router's NAT) behind a NAT (the ISP's NAT) work? As far as I know a NAT works like this: computers A and B ...
ispiro's user avatar
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Set Local IP Addresses for Router as well as DSL Modem

I have a TP-Link TD-8616 ADSL2+ Modem and a GL-B1300 Router running openWrt 18.06.2. Network Setup (topology): ADSL Line > Modem > Router > local devices They both have the default local ...
nemu's user avatar
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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 ...
virmis_007's user avatar
1 vote
1 answer
11k views

Default gateway ping too high

I have a cable modem router C7000-100NAS. I can't seem to figure out why when I ping the default gateway(192.168.0.1) I get high pings ranging from 8ms to 500 ms, this is NEVER below 2ms as it should ...
Muhammad Ali's user avatar
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2 answers
3k views

Changing dns server address at router

I have a cable modem+router (let's call it A) and an RJ-45 cat 6 cable which originates from A and goes to another router (B). Most of my wifi enabled devices use B's wifi netowrk. I want to change to ...
virmis_007's user avatar
4 votes
0 answers
3k views

My huawei USB modem inject JavaScript code when surfing any website [closed]

I am using USB modem and noticed that there is javascript code added just before the </body> tag to every website I'm surfing! <script type = 'text/javascript' id ='1as2ys' charset='utf-8' ...
Reham Fahmy's user avatar
2 votes
1 answer
2k views

AT+VCID=1 is not enabling Caller Id on USR modem

I'm testing a USR 5637 USB modem. According to the USR docs I can query modem support for Caller Id with AT+VCID: Debug: modem_write Debug: Write 10: "AT+VCID=?\r" Debug: modem_read Debug: Read 24: "...
jww's user avatar
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My CenturyLink fiber modem is bridged - can I just get rid of it and use my Cisco ASA 5505?

I was about to go on Amazon to buy my own CenturyLink branded fiber modem (Arris C2100T) to replace the one I am renting from the ISP (Arris C3000T), but then I read here on SuperUser that I might not ...
SamAndrew81's user avatar
1 vote
2 answers
2k views

Why does my public IP change when I plug in different devices into the modem?

If I plug my router into my modem, I have one public IP address (as reported by https://www.whatismyip.com and the like). When I plug my computer directly into the modem, my public IP address changes. ...
MWB's user avatar
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1 answer
329 views

How does a xDSL modem connect to an ISP? [closed]

When configuring a modem, configuration such as VCI, VPI and modulation are required. Equally, a VLAN tag e.g. 10 has to be specified. Additionally, a PPPoE client has to be configured to ...
Motivated's user avatar
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Unexpected response to ATZ when attempting to configure USB modem?

I'm trying to use a Conexant USB modem from a C program. The modem is located at /dev/ttyACM0. In the source code I send the AT, then ATZ to reset the modem. I receive the response: $ sudo ./modem....
jww's user avatar
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1 answer
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Time accuracy and network performance

Does an inaccurate clock on an router, modem, affect network performance? Today I was troubleshooting videos loading poorly on my PC. During this I decided to look at the statistics on my modem and ...
jake9wi's user avatar
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1 answer
115 views

Using a cellular modem vs a cellular router to connect to the internet

I am working on a project using an embedded Rasberry Pi computer running Debian to communicate with the internet using 4G. I have used a cellular modem at first, whereby we communicate with the modem ...
Engineer999's user avatar
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1 answer
1k views

How do I find out what this unknown device is on my network?

Backstory: I have a home PC network that is mixed hardwired and wireless, with a wireless access point and hardwired PCs - connected to a dual-WAN capable router, connected to a cable modem, connected ...
Rebeccah's user avatar
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1 answer
717 views

Why my ppp modem interface doesn't show me a public IP address

I have a cellular modem from Zoomtel. I connected my BeagleBone embedded computer running Debian to it via pppd. When I run ifconfig , I see the interface ppp0. However this gets a local IP address ...
Engineer999's user avatar
7 votes
4 answers
13k views

How do I split my modem connection into a router and an additional ethernet output?

I have my cable modem in one room. I have a ethernet wire going through the wall connecting to the router. I have an Office I want to run an ethernet cable to, which would be pretty easy to do if I ...
joel's user avatar
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-1 votes
1 answer
11k views

Huawei HG8245H MAC Address Change (Clone)

My last router had an option to clone/change my router's MAC Address (did this in order to change my public IP Address for x,y,z reasons) On this specific router "Huawei HG8245H"(which is a 2in1 ...
Joe Infourm's user avatar
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1 answer
321 views

NAS setup help w/ home

so I'm not super experienced with Networking, so I may have already committed some Faux-pas in my setup, so please bear with me; I have a HDD connected to my modem (TC8715) that I'd like to use as a ...
Medic3000's user avatar
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6 votes
3 answers
10k views

Receive calls and texts from a mobile modem on Windows 10

Other posts on SuperUser about this issue are either too old to be useful, are for a different operating system, or are not exactly what I am looking for. Background I have a Windows 10-on-Arm ...
Gabriel Fair's user avatar
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-2 votes
1 answer
48 views

Using a mobile hotspot as a modem? [closed]

Do all routers with USB ports for 3G/4G backup connections support all mobile broadband devices? I'm just curious to see if, since I can't get fiber due to my apartment block not being wired for it, ...
Will's user avatar
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1 vote
1 answer
184 views

Delete modems on OS X from the terminal

I attached a dodgy Android device to my Mac, which evidently has caused it to install literally one thousand dialup devices. This is the detail of one such dialup device. Here they appear in the ...
Paul Lammertsma's user avatar
6 votes
5 answers
10k views

Two Internet connections via two modems, one router, specify which modem to use on PC

At work, we have two Internet connections via two modems, one cable modem and one 4G modem. To the cable modem, there is a Wi-Fi router connected, and that is our network A. The 4G modem has a built-...
eliman20000's user avatar
0 votes
1 answer
174 views

Can you direct the modem signal to a router through a switch, then from the router back through the same switch to spread it out to other devices?

Right now this works Modem --> Switch --> Router --> Wifi to many devices I am wondering if the following would work: Modem --> Switch --> Router --> Switch (same one from before) --> Ethernet to ...
Jose V's user avatar
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1 answer
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Reason for double addresses on single computer

I am on the west coast and I am using Sonic fiber internet (sonic.com). The modem provided by the ISP is Pace modem. I am running Ubuntu. In the modem configuration, I saw that my public IP is 198.xx....
lisprogtor's user avatar
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2 answers
46 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 ...
Carylo's user avatar
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0 answers
3k views

How to port forward on my huawei modem (b525s-23a) Minecraft Server

I want to port forward for my Minecraft server. I've literally tried everything. I literally don't know how to configure any of the stuff I've tried correctly. I would like someone to tell me how to ...
dfu815's user avatar
  • 1
0 votes
1 answer
65 views

Can I hook up my old TP-link router with a LAN cable instead of a phone cable?

So I have a TD-W8960N Version 1 modem (router) from 2007. It has a phone line jack and 4 LAN jacks. Years ago I used to connect the modem to the wall phone cable line (using ADSL-splitters and such). ...
Mark Horowitz's user avatar
1 vote
0 answers
349 views

Printer & Roku facing trouble connecting to ARRIS SURFboard SBG6580-2

I recently moved to a new place and had to buy a new cable based modem-router as this new place supports only xfinity. I bought the following modem: https://www.amazon.com/ARRIS-SURFboard-SBG6580-2-...
The Wanderer's user avatar
0 votes
1 answer
2k views

Redirect own WAN traffic to LAN

Let's say my WAN IP is 123.456.789.0 Earlier, when I connected to 123.456.789.0:22 from the LAN, my traffic reached my LAN correctly and the service worked fine. It also worked fine when I connected ...
Hele's user avatar
  • 575
0 votes
0 answers
94 views

What is my internet speed?

First three days The speed in the Router "192.168.1.1" is 5 mbit all the time, and in speedtest.net is 5 mbit. After 3 days The speed in speedtest.net dropped to 4 mbit, but still 5 mbit in ...
amy programmer's user avatar

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