Troubleshooting Here we try to give hints on how to quickly find errors and detect errors in a structured way. Structure in your way to work is one of the most important things when you are trying to find an error. At first you can attack the simple an obvious but after a while without success you need to have a method to go further. Or else it ends up with a lot of time wasted without knowing anything about the cause. Where to start? You start with the most obvious reason, for example if the room is dark you replace the bulb. If that does not do it you replace the fuse. Then you look if there is any power at all in the house or the neighborhood or in town. You can work the same way to delimit errors in the network. The professional way to detect communication errors is to work with a structured model, a model called the OSI model and has been developed especially for describing communication and work on any type, also the human communication can be applied on the OSI model. The model implies that the communication takes place from top and downward thru several layers until you hit the lowest physical layer (cable, air etc) and after transferring the message over distance you work your way upwards to the other part of the communication.
|
When you reach the other part he starts to process the information (application, brain etc). Every layer in this model must be independent from other layers and can be replaced by something else. For example you can replace cupper in layer one to fiber or air without changing layer two (Ethernet) or layer three (IP). You can always start error detection at the application creating the message but that is not rational. It is better to start in the middle between the two who communicate. The middle is in layer one, the cable, fiber or air (the media). If you can see the message here there is nothing wrong on the senders side so you can work your way up to the receiver. If not you go towards the sender. Too see the message on layer one you need tools, in this case a sniffer. We have made a guide of how to look for errors in the different layers. Start here |
External links
Internet
Perform various checks
Check your domain name
Questions on Domain names
Traceroute from different
countries
E-post Control
Adressing
My IP address
Questions on IP addresses
Registered Port Numbers
Registered Mac Addresses
(search)
Wireless
Wireless standards
Wi-Fi
Management
Management Tools
Security
Test your computer
Security Tools
Internet security (PTS)
Operators
Swedish Telephone providers
