Linux Networking.

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This tutorial covers TCP/IP networking and system configuration
basics. Linux can support multiple network devices. The device names
are numbered and begin at zero and count upwards. For example, a
computer running two ethernet cards will have two devices labeled /dev/
eth0 and /dev/eth1. Linux network configuration, management,
monitoring and system tools are covered in this tutorial.

http://www.yolinux.com/TUTORIALS/LinuxTutorialNetworking.html

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