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Wireshark port scan, source port detection and extraction using tshark

 tshark -r traffic.pcap -T fields -e tcp.srcport -Y "ip.src == 192.168.100.103 and ip.dst == 192.168.100.106 and tcp.flags == 0x012 and tcp.srcport < 16384"


Here,


192.168.100.103 is victim and
192.168.100.106 is attacker.

attacker will request whether the port is open or not and the victim will reply so we need tcp.srcport. 

tcp.flags == 0x012 meaning SYN, ACK because if the port is open then SYN, ACK flag will go to from victim to attacker.

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