Binary Tides

A previous post mentions how to send raw packets using winsock api on windows xp. Winpcap is a packet driver useful for packet capturing and sending raw packets on the windows platform.
Raw means we have to cook the whole packet ourselves. A TCP packet for example consists of:
1. Ethernet header
2. IP header
3. TCP header
4. The [...]

Port Scanning searches for open ports on a remote system. The basic logic for a portscanner would be to connect to the port we want to check. If the socket gives a valid connection without any error then the port is open , closed otherwise (or inaccessible, or filtered).