Asynchronous Digital Subscriber Line is a layer 1 networking protocol, typically used for last mile Internet access. It utilises standard telephone cabling and coexists with analogue telephones. An ADSL modem at the customer premises communicates with the DSLAM at the local exchange. ATM is usually used as the layer 2 protocol, with PPPoE or PPPoA used for authentication.
Questions tagged [adsl]
103 questions
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What is the maximum speed of ADSL?
As wikipedia says the max speed of ADSL is 24.0 Mbit/s. However here it writes that Japan provides ADSL service with speed 50 Mbit/s.

NARKOZ
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ADSL modem/router for varied desktop/server network topology
I'm currently running a hybrid home/office network comprising of several iPhones, laptops, and desktops (Windows, Mac), and gaming consoles - an average of 10+ devices connected at once. Vitally, I have a linux server which is publically exposed.…

Adam Wright
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Configuring NAT and static IP on Cisco 877W
I'm having trouble setting up a static IP reservation on a network. What I want to do is assign IP 192.168.1.105 to MAC address 00:21:5d:2f:58:04 and then port forward 35394 to it.
If it helps, output from show ver says Cisco IOS software, C870…

David M Williams
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ADSL to T1, Is it worth it for us?
The company I work for has roughly 45-55 simultaneous users (local and remote/VPN) logged in at a given time. We currently subscribe to an ADSL connection but we have been experiencing slower upload/download speeds as our number of users increase.…
Jack Hickerson
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Dynamic SQM Settings
I've just set up my new router (WRT1900ACS) and installed OpenWRT. I have ADSL which makes it pretty hard to adjust the sqm up/download speed correctly as it differs depending on what day it is. Is there a way of adjusting those settings…

schgab
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Advice needed: ADSL and VPN for a small company
I need advice on purchasing an ADSL modem/router for a small company.
At the moment, we are using the iBurst Wireless service for internet connectivity. I have the iBurst desktop modem, which connects to my Netgear WNR2000 router via ethernet. I am…

Saajid Ismail
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Need to split a high speed ADSL line for several departments
I'll try to keep it simple!
We have a new and very fast ADSL line coming in to our office which needs to be split between 4 different departments.
Each department will have a certain bandwidth available to them and we want them to have a separate IP…
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Cisco 887VA router ADSL configuration
I am attempting to setup a Cisco 887VA to connect out to the internet via a basic ADSL connection.
I have configured it to the best of my ability but its the first one I've ever done and I think I may have overlooked something silly. I have triple…

Becky
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Finding the bottleneck on a connection
I'm currently having issue on a ADSL connection regarding performance.
During the evenings, around 18h00, up until at least 01h00 the connection speed drops down from the +- 600 kb/s (6ish mbit) to a poor 10-150kb/s. (depending on the time and…

Tuinslak
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Is something happening with the ISP market in UK?
We're being forced to look at rather expensive leased lines due to our distance from the exchange. Even on the new ADSL2+, we can't get much more than 3MBit/s but more importantly, we need to improve our upload speed.
Several vendors have offered us…

Rob Nicholson
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DSL modem in bridge mode but router not accessible from the internet
I have a DLink ADSL modem which I have put into bridge mode and connected to a Fortigate 200A firewall. The Fortigate is able to connect through PPPoE and receives the static public IP. I can browse the internet through the Fortigate with this…

blizz
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Connecting a switch to a VDSL2 model causes upload speeds to go to 0
My network configuration has my main router connected to a secondary router which is in bridge mode, and I have a computer connected via ethernet to that secondary router.
If the connection between my main router and secondary router is through an…

Amandeep Grewal
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Cisco 877 configuration with multiple firewalls behind in parallel using public IP's
I would like to ask how I can configure my cisco 877 adsl router to have multiple firewalls installed in parallel behind the cisco 877 router. I have enclosed a diagram of what I am trying to achieve. I have a multiple public IP's and I wish to…
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ADSL Router - Access External IP internally
I have a problem when I'm doing an access using my DNS hosted at another server, which performs a redirect to my internal network.
example:
User attempting access to internal DNS: intranet.site.com: 8090 (182.12.1.1:8090> 192.168.1.151:80)
My router…

GlobSecure
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Router in half bridge floods arp cache
I've set up a Slackware (14.0) box as a gateway for my adsl connection. I have a modem set up in half bridge mode between the NIC and the phone line, and the interface takes up the dynamically assigned public ip via DHCP. I've found the for every…

Robbie Mckennie
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