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Questions tagged [modem]

For questions about modems in relation to computer networks and network devices. Remember that only on topic modem network devices should be used. For instance, your company has an ADSL modem, that might be defect.

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8 views

WiFi modem with outgoing traffic firewall [closed]

So here is the problem- I have a compromised macbook, seems that reinstalling the whole system doesn’t work, as what’s there inside is deeper then OS level. I need a device, that acts as a wifi modem (...
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14 views

Understanding the reasoning behind PLMN Not Allowed error [closed]

I am seeing a bunch of Attach Reject for each Attach Request being sent, and the cause is PLMN Not Allowed - Cause value = 11 From what I read, it implies the network ID is stored in the PLMN ...
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2answers
32 views

How does the computer detect the routers Around? [closed]

I can see any wireless modem around(networks) in internet access icon , How routers say to my computer "hey I am here ?" is it port forwarding ? upnp ? IGMP ? which protocol they send and ...
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2answers
40 views

Bridge mode or straight replacement?

Let's assume the ISP is malicious. They have remote access to their own gateway/router. No way to remove that remote access. But ISP allows using a different gateway/router. Security-wise, what is ...
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1answer
27 views

Who initiates PPP Keepalives after PPPoE session is Established between Modem and BNG?

Hello Everyone, In case of DSL Modem , normally service providers employ PPPoE connection between Modem and BRAS (BNG). We all know that when Modem dials , it goes through PPPoE stages namely 1 ) PADI ...
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1answer
33 views

How are Upstream Frequencies assigned for Cable Modems? [closed]

For the past week I've had serious internet issues where people couldn't use my services because of packet loss and upload speeds plummeting to kbit/s resolution (0.09 mbit/s). I noted that one of my ...
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0answers
19 views

Why do cellular IP modems have configuration settings for transparent modes

I'm working in an area with industrial cellular IP modems such as ones from the company Four Faith. A manual is available from the URL On page 27/40 it describes a setting called "Transfer ...
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1answer
51 views

EdgeRouterX not routing traffic [closed]

New to this. I have a tc4400 modem which works fine: when connected straight to my computer, internet passes. However when I connect my EdgeRouterX to the modem and ssh into the router, pinging any ...
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1answer
153 views

Cisco packer tracer training - exercise 2.1.1.5 [closed]

I’m currently starting Cisco and using the packet tracer course, but I’m having an issue with a section creating a simply topology. Everything good apart from one thing which is from wireless router ...
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2answers
126 views

Modems involved in dial-up connection

I am currently studying the textbook Computer Networking -- A Top-Down Approach (7th Edition) by Kurose and Ross. In a chapter on Home Access: DSL, Cable, FTTH, Dial-Up, and Satellite, the authors ...
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3answers
7k views

Is an ONT a modem? [closed]

I was helping a friend set up a simple home network after a move recently. He referred to his ONT as a modem, and I was tempted to say "well, actually, that's not a modem..." I didn't, because I ...
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2answers
266 views

Internet Entry Point

I am learning netwroking and would like to ask about how exactly we (as a casual user) get connected to internet and how a datacenter would do the same thing. i bet they dont use a regular modem which ...
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1answer
57 views

CSU/DSU's and DSL modems

I read a few times that DSL modem isexample of CSU/DSU. To my understanding CSU/DSU connect digital communication method to digital while DSL modulate digital communication to analog. If so, how can ...
2
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0answers
70 views

Simulating TCP/IP Illustrated Test Network [closed]

I just recently bought TCP/IP Illustrated volume 1 first edition for cheap and I see that they reference a test network throughout the book that looks like the following Now I'm not the sharpest tool ...
2
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1answer
2k views

Can VPN on router connected to the modem bypass a double NAT created by two routers unbridged and connected to each other?

I can't seem to get my head around this scenario. If I am right, a VPN configured on the client-side/workstation would definitely bypass double NAT but on this scenario: Modem <-bridged-> Router ...
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2answers
399 views

What is a “rotary dialer” in the context of dialup connections?

Some friends and I have discussed setting up a PPP dialup Internet gateway (solely for private use) for fun/nostalgia purposes. I've been reading through the Linux-PPP Howto at TLDP (old, I know, but ...
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2answers
121 views

Is the `twisted-pair` line transfer `digital data` and `ADSL` line transfer the `modulated electrical signal`?

From the WiKi: Modem (modulator–demodulator) is a network hardware device that modulates one or more carrier wave signals to encode digital information for transmission and demodulates signals to ...
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1answer
2k views

Can all ports on nowadays switches act as uplink ports? [closed]

I basically know nothing about networks (I just learned what switch meant yesterday), and English is not my first language but I hope I can make my question clear. So I just moved into a new house, ...
1
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1answer
131 views

Configuring Cisco ISR 1861 with External Cable Modem

I picked up an 1861 for cheap and I am trying to set it up for home lab. I have taken the Cisco courses for CCNP and I think if this was just a regular router or switch I would be OK, but I can't ...
2
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1answer
1k views

Intermittent periods of high packet loss, one hop beyond router

I've been trying to diagnose internet connection issues at a remote small business for which I am the system administrator. If this is not the proper Stack Exchange to post to, I'd really appreciate ...
0
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1answer
77 views

Modem configuration with many public ip [closed]

I need to configure a modem for my asdl connection. I have 4 public ip to manage: 1 for my modem the others for servers that are on my LAN The situation is this: My problem is: which is the ...
2
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3answers
269 views

Does a dial-up modem support multiple users?

Since I have never worked with a dial-up modem, I was wondering if it created an internet connection for only one user, a point-to-point connection, or if it also supported multiple users.
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1answer
1k views

What could cause kvm virtualized pfsense to get 84mbps behind physical pfsense, but then drop to 1mbps when it replaces physical pfsense?

I'm scratching my head on what could cause the following behavior: Scenario A: Laptop -> virtualizedpfsense -> switch -> physicalpfsense -> modem speedtest.com gives me 84mbps download (...
1
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1answer
271 views

Modem/device that can connect and route calls depending on type?

There are ways of allowing fax machines to share the same line as telephones and telephone answering devices. Back in the BBS days, a lot of people had dedicated phone lines for their BBS. A caller ...
2
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1answer
607 views

Can a VDSL2 to Ethernet converter be used as a replacement for a bridging VDSL2 modem?

I've got my own network infrastructure already, but I'm tied to my ISPs modem which is a bit on the flaky side. The modem is in bridging mode, with the perimeter router behind it handling ...
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2answers
150 views

Specific web site traffic on 2 ISPs

There's a company (B2B interface) that provide certain services through a custom ISP (DSL), but this limits the internet connection only to this site, and on the office we have an regular ISP (DSL) ...
2
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2answers
124 views

Why Business Class router don't usually include ADSL?

I am shopping for a good VPN router to replace my terrible stock ADSL modem + router from my ISP, which need to be restarted 4 times a day. This is for my office use, which connected by around 17 ...
3
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3answers
334 views

Are modems needed to connect routers?

I apologize for the stupid question; I'm trying to wrap my head around the basics of networking. Also, please feel free to direct me to the right SE forum, if this is not the right place. My question ...