A quick list of tools

netcat

Read and write data across network connections using TCP or UDP protocols.

netcat IP PORT MESSAGE

nmap

Network exploration tool and security / port scanner.

nmap -sP SUBNET/MASK

tcpdump

Capture and save TCP and UDP data on a network.

sudo tcpdump -D

Filters:

• host filter by host ip address or hostname
• src filter by senders ip address or hostname
• dst filter by receivers ip address or hostname

Filters can be combined using and/or.

telnet

Used for interactive communication between using the TELNET protocol.