Summary from the Introduction to Linux by OnWorks

Skip to content

• Apply all available updates.

• Re-examine the system: block off unnecessary services, check firewall rules and other access policies.

• Reconnect.

10.6. Summary

Linux and networking go hand in hand. The Linux kernel has support for all common and most uncommon network protocols. The standard UNIX networking tools are provided in each distribution. Next to those, most distributions offer tools for easy network installation and management.

Linux is well known as a stable platform for running various Internet services, the amount of Internet software is endless. Like UNIX, Linux can be just as well used and administered from a remote location, using one of several solutions for remote execution of programs.

We briefly touched the subject of security. Linux is an ideal firewall system, light and cheap, but can be used in several other network functions such as routers and proxy servers.

Increasing network security is mainly done by applying frequent updates and common sense. Here is an overview of network related commands:

Table 10-2. New commands in chapter 10: Networking

Command	Meaning
ftp	Transfer files to another host (insecure).
host	Get information about networked hosts.
ifconfig	Display IP address information.
ip	Display IP address information.
netstat	Display routing information and network statistics.
ping	Send answer requests to other hosts.
rdesktop	Display and MS Windows desktop on your Linux system.
route	Show routing information.
scp	Secure copy files to and from other hosts.
sftp	Secure FTP files to and from other hosts.
ssh	Make an encrypted connection to another host.

ssh-keygen	Generate authentication keys for Secure SHell.
telnet	Make an insecure connection to another hosts.
tracepath/traceroute	Print the route that packets follow to another host.
whois	Get information abotu a domain name.
xclock	X Window clock application, handy for testing remote display.
xhost	X Window access control tool.