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NMAP (3)

FTP Bounce Send PORT command to the FTPD with the ip-address of the host which is being scanned. Depending whether a port is open or not, the FTPD will give a different reply (only works with old ftpds) nmap 192.168.0.1 -b bouncer_ftp

UDP Scans ICMP Port Unreachable: host sends ICMP_PORT_UNREACH when a UDP packet is sent to a closed port. recvfrom(), write() scan: on linux, when writing or receiving to/from a closed UDP port , an error returns ICMP Pingsweep: well, as the name says ;)