A SysAdmin's Guide to Network Management
If you're a sysadmin, your daily tasks include managing servers and the data center's network. The following Linux utilities and commands—from basic to advanced—will help make network management easier.
In several of these commands, you'll see
<fqdn>, which stands for "fully qualified domain name." When you see this, substitute your website URL or your server (e.g.,
server-name.company.com), as the case may be.
As the name suggests,
ping is used to check the end-to-end connectivity from your system to the one you are trying to connect to. It uses ICMP echo packets that travel back to your system when a ping is successful. It's also a good first step to check system/network connectivity. You can use the
ping command with IPv4 and IPv6 addresses.
Read more at OpenSource.com