Everyone that connects to an network, has got a IP address. A IP address looks something like this : 80.65.123.25
Your network card has an IP and your modem has an IP address if you connect to the Internet, but both is diffident because your LAN is not part of the internet. When you connect to Internet, depending on your connection, you get a fixed ( static ) IP or a dynamic IP. Modem users gets a IP address that changed every time they reconnect to internet, Very useful if you attack people, so if you disconnect, then you get a diffident IP. If you have a ISDN or maybe ADSL connection most of the time you will get a static IP, so whenever you connect to internet you get the same IP every time. Attack someone without IP spoofing, they will be able to see it is your IP attacking them! They can then go to your ISP ( internet service provider ), check who does this IP belong to and you can get into trouble. This is where modem users are lucky, they don't have a static IP and then can go mad and attack people and so without being caught, well almost... Their ISP can still check who was using the certain IP for a certain time and what telephone number it was coming from, but its too much of a hassle for a simple DOS attack.
IP spoofing is basically when you attack someone and you use a bogus IP. a DOS attack or whatever, it attacks the target, but the target only receives data from bogus IP's. IP's that does not really exist, or it does excist but it is someone else's IP, not yours.
Every network cards has a burned in MAC address. a MAC address looks something like this : 00-40-AH-4E-E0-90, it cannot be changed - well kind of, so if you attack someone and they do a nbstat on you, get your MAC address of your network card, it is a simple way of identifying you as the attacker.
Your network card has an IP and your modem has an IP address if you connect to the Internet, but both is diffident because your LAN is not part of the internet. When you connect to Internet, depending on your connection, you get a fixed ( static ) IP or a dynamic IP. Modem users gets a IP address that changed every time they reconnect to internet, Very useful if you attack people, so if you disconnect, then you get a diffident IP. If you have a ISDN or maybe ADSL connection most of the time you will get a static IP, so whenever you connect to internet you get the same IP every time. Attack someone without IP spoofing, they will be able to see it is your IP attacking them! They can then go to your ISP ( internet service provider ), check who does this IP belong to and you can get into trouble. This is where modem users are lucky, they don't have a static IP and then can go mad and attack people and so without being caught, well almost... Their ISP can still check who was using the certain IP for a certain time and what telephone number it was coming from, but its too much of a hassle for a simple DOS attack.
IP spoofing is basically when you attack someone and you use a bogus IP. a DOS attack or whatever, it attacks the target, but the target only receives data from bogus IP's. IP's that does not really exist, or it does excist but it is someone else's IP, not yours.
Every network cards has a burned in MAC address. a MAC address looks something like this : 00-40-AH-4E-E0-90, it cannot be changed - well kind of, so if you attack someone and they do a nbstat on you, get your MAC address of your network card, it is a simple way of identifying you as the attacker.