Whats the Difference Between TCP Connection Attempts and UDP Packets?
A connection attempt is just a TCP packet that is asking to establish a connection to or from your computer. The connection may last anywhere from milliseconds to hours. A UDP packet, on the other hand, is a single packet used to transmit information without the promise of any additional information being transmitted. Your computer can send or receive a single UDP packet to exchange information without any connection being established. Both kinds of packets are being used when you use a web browser to download a web page. If you go to http://www.atguard.com, for example, your computer first sends a UDP packet out into the world to try to find out what the 4-byte Internet Protocol address is for the computer called “www.atguard.com”. The protocol used to do that is called DNS, or Domain Name Service, and the queries and replies take place without any persistent TCP connections being made. Having a rule to permit this is important or your computer wouldn’t be able to talk to other machin