Hi there,
You all know how to check TCP port connectivity from a Linux or UNIX machine to a remote machine using telnet as per th example below
$ telnet 127.0.0.1 25
but we can't adopt TELNET to check UDP connectivity.
Linux and most of the UNIXes come with a network layer utility called nc (abbreviation for netcat) which is very useful to check UDP connectivity and to explore a lot with both TCP and UDP.
An example is shown below
# nc -v -u -z -w 3 172.24.16.131 123
Connection to 172.24.16.131 123 port [udp/ntp] succeeded!
