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Nmap

TCP flags

Flag Description
ACK Acknowledge
SYN Synchronize
URG Urgent
PSH Push
RST Reset
FIN Finish

TCP

Bash
# Syn (Discreet)
nman -sS <ip> -f
# Connect (Not very discreet)
nman -sT <ip> -f
# NULL + FIN + XMAS
nmap -sN <ip> -f
nmap -sF <ip> -f
nmap -sX <ip> -f

UDP

Bash
nman -sU <ip>

Sources