The Mudcat Café TM
Thread #143779 Message #3320813
Posted By: treewind
10-Mar-12 - 04:57 AM
Thread Name: Tech: Port Query
Subject: RE: Tech: Port Query
If you want to port scan your own network, you have to get someone else to do it for you. I think there are web sites that will do it - basically they try to connect to your computer via your ADSL link on every port number and see if they get a response, then send you back a list of which ones responded.
To get a response, your router has to allow the connection in AND your computer has to have some process listening on that port number.
Port numbers are what identifies an incoming packet so the computer knows which running process to send it to. There are well known standard numbers like 80 for a web server and 21, and 23 for ftp, for example.