Basic Network Troubleshooting
Once you have a Linux kernel installed, you can do a few things to check to make sure things are operating properly. The following sections walk through the commands you should know to monitor the network activity, including watching what processes are listening on the network and what connections are active from your system.
Sending Test Packets
One way to test network connectivity is to send test packets to known hosts. Linux provides the ping and ping6 commands to do that. The ping and ping6 commands send Internet Control Message Protocol (ICMP) packets to remote hosts using either the IP (ping) or IPv6 (ping6) protocol. ICMP packets work behind the scenes to track connectivity and provide control messages between ...
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