- Port scan using nmap
Download and install nmap
- Scan all ports
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$ nmap localhost
- Scan specific port
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$ nmap -p 8080 localhost
- Scan specific port range
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$ nmap -p 8080-9090 localhost
- Scan server which is blocking pings
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$ nmap -sT -P0 -p 8080 localhost
$ # -sT (TCP connect)
- Scan server with firewall enabled ACK Scan
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$ nmap nmap -sA -p 8080 localhost
$ #ACK Scan (-sA)