-i Displays the interfaces configured by ifconfig-s Lists a summary of activity for each protocol-v Gives verbose output, listing both active and inactive sockets-c Updates output every second (good for testing and troubleshooting)-e Gives verbose output for active connections only-C Displays information from the route cache and is good for looking at
past connectionsSeveral other options are available for this command, but they are used less
often.
Network Configuration Files
As previously stated, five network configuration files can be modified to
make changes to the basic network interaction of your system:
/etc/hosts—A listing of addresses, hostnames, and aliases
/etc/services—Network service and port connections
/etc/nsswitch.conf—Linux network information service
configuration
/etc/resolv.conf—Domain Name System (DNS) domain (search)
settings
/etc/host.conf—Network information search order (by default,
/etc/hosts and then DNS)After these files are modified, the changes are active. With most configuration
files, you can add comments with a hash mark (#) preceding a comment. All
these files have man pages where you can find more information.
Adding Hosts to /etc/hosts
The /etc/hosts file is a map of IP addresses to hostnames. If you are not
using DNS or another naming service and you are connected to a large
network, this file can get quite large, and managing it can be a real headache.
A small /etc/hosts file can look something like this: