One of the tools in any system engineer’s hand as well as those dealing with customer remote service is to set a remote connection to the other end’s server or PC, through VPN, Public IP or any other possible way. One easy yet effective approach is to establish a ssh tunnel by means of reverse SSH.
Here is a simple, to the point manual on linux iptables:
Port numbers which are recognized by Internet and other network protocols, enabling the computer to interact with others.
Each Linux server has a port number (see /etc/services file). For example:
Subnetting Class C – Overview
When you see a subnet mask or slash notation (CIDR) you should know the following:
How to broadcast a message in windows:
The service used for this is called messenger. you need to make sure the service is up and ready. The command that is used is net send