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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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7 views

Hook second router to internet wirelessly? [closed]

I have a router hooked up to a modem, and I have another router. What I want to do, is have the router broadcast a completely different network than my other router, but still have my second router ...
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1answer
28 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 ...
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12 views

CSU/DSU and Modems [duplicate]

So after a lot of research over the internet i couldn't get to a clear answer To my understanding so far modem is: piece of hardware which enables us convert digital signal to analog signal(and vice ...
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0answers
48 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
460 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
386 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
44 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
420 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, ...
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1answer
79 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 ...
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1answer
605 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 ...
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1answer
43 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 ...
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3answers
101 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
497 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 (...
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1answer
164 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 ...
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1answer
183 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
132 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) ...
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2answers
85 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 ...
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3answers
243 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 ...