nc — arbitrary TCP and UDP connections and listens
The nc (or netcat) utility is used for just about anything under the sun involving TCP, UDP,
or UNIX-domain sockets. It can open TCP connections, send UDP packets, listen on arbitrary
TCP and UDP ports, do port scanning, and deal with both IPv4 and IPv6. Unlike telnet(1), nc
scripts nicely, and separates error messages onto standard error instead of sending them to
standard output, as telnet(1) does with some.
udp socket 을 구현하여 그 동작을 확인하기 위한 목적으로 nc를 사용하였다.
~$ nc 192.168.1.1 6667 -u
위와 같이 실행하여 입력하면 바로 sendto 가 가능하고 거기에 대한 recvfrom로 즉각 확인이 가능하다.
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