Custom message SSH before login prompt in Linux

Tested on ubuntu 18.04 server 

The file /etc/issue.net is a text file which contains a message or system identification to be printed before the login prompt of a telnet session. It may contain various ‘%-char’ (or, alternatively, ‘\-char’) sequences.

The common char for output some informations are:

b   Insert the baudrate of the current line.
d   Insert the current date.
s   Insert the system name, the name of the operating system.
l   Insert the name of the current tty line.
m   Insert the architecture identifier of the machine, e.g., i686.
n   Insert the nodename of the machine, also known as the hostname.
o   Insert the domainname of the machine.
r   Insert the release number of the kernel, e.g., 2.6.11.12.
t   Insert the current time.
u   Insert the number of current users logged in.
U   Insert the string "1 user" or "<n> users" where <n> is the
    number of current users logged in.
v   Insert the version of the OS, e.g., the build-date etc.

If you want to display your IP Configuration you can simply add the following line to the issue file:

My IP address: \4{eth0}