Alternative port scanning tools.

Portscan with netcat

Scans specific IP between tcp port 20 – 65000.

Check open ports outbound from host with Wget

Check outbound rules from specific host. If TCP SYN is received on tcpdump the outbound port is allowed.

On victim:

On attacker:

Python script / piescan

https://github.com/m57/piescan/blob/master/piescan.py

Port scanning – alternative