Computer Security and Hacking :: Internet Security

Getting Ips--To wait the ip totally computers you atomic number 18 connected to (web servers, people attempting to hack into your computer). Go to dos (startrun geek command) and run the netstat command. grapheme netstat /? for details. Type netstat -r at the command prompt to see the ip of all computers you atomic number 18 connected toIn MSN (and some other programs) when you argon chatting to someone everything you grapheme goes by the MSN servers first (they act as a proxy) so you see their ip rather than who you are chatting to. You cease repulse round this by sending them a file as MSN doesnt send file through its proxy.When you type the netstat -r (or -a for a antithetical view) the ips are under the foreign speech communication table. The ports are separated by a . Different programs use dissimilar ports, so you lav work out which ips are from which program. Connecting to other computers and what ports are--Servers send information. Clients retrieve. Simple. Wi ndows 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 boots (ip number or a name that is translated into the ip automatically) Different programs give different ports, but they always open the same ports so other computers know which port to connect to. You behind 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, face 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, youre in. Wow. You are connected to Yahoos 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 go forth do something. On an http server it will just wonder what the hell you are on about. Type get / http/1.