[2 days left] What’s wrong with your cloud strategy? Learn why multicloud solutions matter with Nimble Storage.Register Now

x
?
Solved

dsl modem - protocols used?

Posted on 2003-10-28
6
Medium Priority
?
254 Views
Last Modified: 2010-04-11
I've been wondering about the way the dsl modems work in terms of protocols.
Since, I could not find much of documentation on this:
What protocol is used for the connection between the pc and the modem?
 
0
Comment
Question by:sinexec
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
6 Comments
 
LVL 31

Expert Comment

by:qwaletee
ID: 9637446
The PC and modem typically connect over Ethernet. Some modems that offer a USB option connect via USB, with the PC thinking that at the other end of the USB cable is an external Ethernet adapter.
0
 
LVL 31

Expert Comment

by:qwaletee
ID: 9637451
(That's technicaly 10Base-T -- 10 mbit Ethernet over twisted pair wiring.  It could use 100Base-T, but since all DSL modems are slower than 10 anyway, they don't bother putting in 100-capable hardware for the PC connection.  All current Ethernet cards for PCs are 10/100 autosensing, so that is not a problem.)
0
 

Author Comment

by:sinexec
ID: 9637590
May be I did not word my question clearly.
Ethernet is a layer 2 protocol, but what protocol is used for the communication between pc and modem over Ethernet.
It does not seem to be IP, since the modem's ip-address does not appear to matter - the communication still takes place. Or I am wrong?
0
Veeam Disaster Recovery in Microsoft Azure

Veeam PN for Microsoft Azure is a FREE solution designed to simplify and automate the setup of a DR site in Microsoft Azure using lightweight software-defined networking. It reduces the complexity of VPN deployments and is designed for businesses of ALL sizes.

 
LVL 18

Expert Comment

by:JConchie
ID: 9637852
Ethernet is not a protocol, it is a set of standards:

"802.3 - Hardware standards for Ethernet cards and cables
802.5 - Hardware standards for Token Ring cards and cables
802.2 - The new message format for data on any LAN
The 802.3 standard further refined the electrical connection to the Ethernet. It was immediately adopted by all the hardware vendors. Today all cards and other devices conform to this standard"

You are either using TCP/IP  or netbeui (which is a broadcast protocol) if you are using windows machines, appletalk if macs or spx/ipx if novell.  

Given your comment on the modems ip address, I would bet that you are using netbeui.
0
 
LVL 31

Accepted Solution

by:
qwaletee earned 340 total points
ID: 9637978
There are lots of different setups.  PPPoE (guess which protocol!) will work differently from static.  I have seen static setups where the DSL modem was an IP router -- and others, where it was not.  USB will obvisouly use the USB driver.

With the exception of PPPoE, the PC really does not know anything except for IP/ARP addressing.  If the modem has an IP on teh smae subnet, then the PC will use it as a gateway.  if it does not, then the mdem is acting as a bridge, and the PC is still just putting out IP.ARP packets, with the bridge picking up the gateway-bound packets and forwarding them on via the ATM DSLAM connection.
0
 

Author Comment

by:sinexec
ID: 9638034
Thanks. I've had PPP over Ethernet in my mind, but I wasnt sure...
0

Featured Post

Fill in the form and get your FREE NFR key NOW!

Veeam® is happy to provide a FREE NFR server license to certified engineers, trainers, and bloggers.  It allows for the non‑production use of Veeam Agent for Microsoft Windows. This license is valid for five workstations and two servers.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

If you’re involved with your company’s wide area network (WAN), you’ve probably heard about SD-WANs. They’re the “boy wonder” of networking, ostensibly allowing companies to replace expensive MPLS lines with low-cost Internet access. But, are they …
This article will show how Aten was able to supply easy management and control for Artear's video walls and wide range display configurations of their newsroom.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're interested in additional methods for monitoring bandwidt…
Suggested Courses

656 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question