Hot answers tagged

40

It's not the length (100 meters -approximately 330 feet- is the max for ethernet UTP), but most likely the quality of the cable is bad. Maybe the cable is damaged internally or at some point was pinched severely. This is not always visible from the outside. Could also be that one or both ot the RJ45 connectors is crimped on badly or is incorrectly wired. (...


33

No. You need to configure so the routers have different IPs. Preferable, you assign 192.168.0.1 to the Virgin router, and 192.168.0.2 to the Sky router. This you do with the Sky router disconnected from the Virgin router, via a wireless client. Also, you need to turn off the DHCP server on the Sky router. Then connect the Sky router from LAN port to LAN port ...


23

When I first read this I thought it didn't make sense because something cannot 'intrude' in a kernel. However Googling it I found similar posts (which also give the answer), but also list that the message was something like: kernel: Intrusion detected from ... which means something quite different. The kernel (software) on your router is letting you ...


13

Short answer: yes. Suppose an ISP has 100 megabits to the internet. They might have 100 customers, each with 2 Mbps each. They are assuming that all 100 customers will not use that 2 Mbps at once. They may even use devices to "shape" the traffic to make it so everyone gets a fair share if everyone tries to use their max speed at once. Also, 2 Mbps is ...


13

VDSL is not compatible in any way with ADSL. VDSL2 capable line cards (the ISP end) are compatible with ADSL2+ ADSL2 and ADSL - so you can use these modems on a VSDL2+ connection - Its easier to find on this juniper networks document, as well as this broadband-forum presentation - I am unclear if its possible to use a VDSL2 modem with an ADSL connection ...


6

He left it for a reason. They are dirt cheap, have no user-serviceable parts and, therefore, are virtually worthless to fix. Your router doesn't have to fall or be be "electrocuted" to go bad. Normal household power glitches can damage it. The data or power connectors can come loose internally. Overheating can cause any of the electrical components to stop ...


6

They are not saying that you will get to enjoy 2Mbps of bandwidth between your computer and your favorite website. The speed that is advertised is the speed between you and your ISP. There are dozens of variables that will control/limit your speed to "the Internet". Some variables: Route of traffic to remote site Response of Remote server In many cases ...


6

You should configure your routers' DHCP private network address assignment. You should configure VirginRouter to assign addresses to DHCP clients on private network 192.168.1.x, and SkyRouter to assign addresses on private network 192.168.2.x . Let's investigate your current situation: Let's say that Virgin assigns your modem IP addr 72.22.22.22. Let's ...


5

First, you should install DynDNS client if your router does not support it. Second, you need to forward port 80 to the server machine. You should not be able to link to your router from the Internet ("the outside") as this would be a security hole. Do you really need to configure it from outside? I doubt it. If you do, you should be able to set this in the ...


5

Try these commands from the command line: nslookup bbc.co.uk ping bbc.co.uk telnet bbc.co.uk 80 The first command checks whether your computer can resolve the name. The second command checks whether the routing is set up correctly (i.e. packets can travel between your computer and the server). Note that not all servers allow ping. If in doubt, try with ...


5

What you're doing makes no sense - stop it now. The RJ11 port, on either box, is for the DSL link ONLY, it connects via your filter to your phone line and then onto the DSLAM using PPOA - it has nothing to do with ethernet ok. You simply need to connect your machines together via IP and configure them to route between each other - if you can't do this then ...


5

The issue is the number of feet of telephone wire from your jack to the central office. Even homes a block or two away can differ by thousands of feet of wire. For example, ADLS2+ typically achieves speeds of up to 20Mbps through half a mile of wire (1Km). Bump that up to 2.5 miles (4Km) and you're down to 2Mbps. If there's sufficient demand, they can add ...


5

Yes. Simply disable NAT and DHCP service. You want it to be just a bridge, with wireless AP mode on. Use one of the LAN Ethernet ports to connect it into your home LAN (e.g. into a LAN port of your upstream router).


5

Your line runs between a pair on the MDF (main distribution frame) at the central office and a box on the street, which then connects to the NID at your home. There are OE and CP blocks on the frame (OE=office equipment or the phone switch, and CP=cable pair, or out to the street) that connect between your pair and the phone equipment. When DSL is installed, ...


5

PPPoE clients use PPPoE Active Discovery to discover PPPoE Access Concentrators (servers) on the network. The first packet the client transmits is a PPPoE Active Discovery Initiation (PADI) which is sent to the Ethernet broadcast address (all ones in binary, all f's in hex: ff:ff:ff:ff:ff:ff). And PPPoE ACs on the network respond with PADO's (Offers). The ...


5

I have had a cable of 30M be faulty, and a cable tester (albeit a cheap one) showed it as OK / didn't detect a fault. It may be that longer cables can be trodden on and that makes them less reliable(by damaging them). The kind of ethernet cables that I find to be reliable, have been one with a rugged jacket, they are expensive, and maybe a better quality ...


5

How can be SNR be so bad if the line attenuation is so low? I live a couple hundred meters from the local telecommunications cabin. Notes: The local telecommunications cabin is not necessarily the location of the DSLAM (where the ADSL line terminates). The DSLAM could well be further away as they are often located in the nearest telephone exchange ...


5

Is DSL digital or analogue? The various flavors of xDSL, or Digital Subscriber Line, all employ sophisticated digital signal processing to transmit digital information over twisted-pair wires. Such signals are simply called "digital" signals for convenience. However this is an analog world (unless you're studing sub-atomic particles, where quantum physics ...


4

Is the firmware up to date? Do you do much torrenting? They often reboot when they overflow the address space which torrents can do. There are a lot of discussions about Billions at Whirlpool which may be able to help/ Billions are pretty tetchy with noisy power. I had a problem with one every time I plugged and external HDD in. It turns out the HDD's power ...


4

Not all ADSL modems are created equal. Here in the UK it is well worthwhile getting a modem based on an Alcatel chipset if British Telecom is your local loop supplier. Why? Because if you have a fault and your ISP gets a BT engineer to call around, they will plug in their own Alcatel based modem and if it works, you will be charged for wasting the engineers ...


4

You have to request a static IP address from your ISP - they will walk you through configuring you ADSL modem. You will have to pay extra for the privilege, though.


4

This is your router letting you know that it's doing its job. It's not really an intrusion but rather an intrusion attempt. This sort of thing happens all the time. Don't worry, you're fine.


4

Electrically its unlikely - the connectors on the standard ethernet jacks are recessed and are unlikely to make contact with anything. Tripping on it and falling (or the system dropping) on the other hand, can potentially be quite catastrophic


4

You need to buy either: A) standalone ASDL modem to plug into your existing router. B) A combined ASDL modem-router. (Which you can check beforehand if it supports DD-WRT) Also, lay off the question marks a bit ;)


4

I'd like to capture the data sent by my ADSL modem (what's really sent on the RJ11 cable). That's what an oscilloscope is for. ... I'd like to build a mini-computer ... A mini-computer is a low-cost computer (i.e. 16-bits) circa the 1970-80s. That term is now deprecated. ... with 2 RJ11 plug, one connected to the modem, one to the telephone plug,...


4

Here's how it work with my setup: The modem will try to negotiate layer one communication with the DSLAM. I don't know much about this part, so I won't go into that. I have a router (which in general can be integrated into modem) that initiates PPPoE session and the modem then encapsulates PPPoE into PPPoA. Different set-ups do this part of the story ...


4

It is up to your phone company to patch your line to the new ISP's DSLAM. When you signed up with the new ISP - they placed the transfer order with your local phone company and the phone company scheduled a date when the switch would happen. Your new ISP should be able to look up the date for you. The delivery of the new modem may happen before the switch - ...


4

You don't have a choice. I'm pretty sure you can't even buy a plain bridging-only DSL modem today. Almost all DSL modems will support PPPoA or PPPoE, and they never support bridging over PPP*, so if you had any of the PPP* modes enabled, it would be, at the very least, doing one-address NAT gatewaying, not plain bridging. The standard for plain bridging ...


4

It could be that you are using an incorrect category cable. You didn't mention what speed you are using. Here is a link to Cisco's explanation of cable types. At a minimum you should be using CAT 5 cable, this gives minimum error rate for 100BT and lower. With Gig-E widely available, CAT 6 cable is needed for the length run you state. http://www....


4

Sorry, but no. DSL and ADSL use frequencies to carry the data which are above the frequencies which ordinary phone lines will carry. Special conditioned lines without load coils must be used, and those lines, when they reach the Central Office, are hardwired to strip off the frequencies used for data and do not allow that data to connect to the Public ...



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