Computer Security and Hacking :: Internet Security

Getting Ip's:-- To see the ip all computers you are connected to (web servers, people attempting to hack into your computer). Go to dos (start>run>type command) and run the netstat command. Type netstat /? for details. Type netstat -r at the command prompt to see the ip of all computers you are connected to In MSN (and other programs) when you are chatting to someone everything you type goes through the MSN servers first (they act as a proxy) so you see their ip rather than who you are chatting to. You can get round this by sending them a file as MSN doesn't send file through its proxy. When you type the netstat -r (or -a for a different view) the ip's are under the foreign address table. The ports are separated by a : . Different programs use different ports, so you can work out which ip's are from which program. Connecting to other computers and what ports are:-- Servers send information. Clients retrieve. Simple. Windows comes with a built in program to connect to other computers called telnet. To start Windows telnet Start menu> Run> type Telnet. Click connect> remote system Ports are doors into computers. Hosts are computer names (ip number or a name that is translated into the ip automatically) Different programs open different ports, but they always open the same ports so other computers know which port to connect to. You can get a port list listing all the different ports, but a basic one is: 11 :- Sends info on the computer 21 :- FTP (File transfer program) 23 :- Telnet (Login to the computers command line) 25 :- Smtp (Sends mail) 80 :- Http (Web pages) There are thousands of different programs using different ports. You can get programs called portscanners which check a computer for all ports up to a certain number, looking for ways in. You can portscan a computer looking for ways-in. Anyway, back to telnet. Type www.yahoo.com as the host and port as 80 the click connect. If nothing happens, you're in. Wow. You are connected to Yahoo's server. You can now type http commands (you are connected to an http server, so it supports http commands). Ie. on an ftp server you can type open and it will do something. On an http server it will just wonder what the hell you are on about. Type get / http/1.