Guide to Unix/Commands/Networking

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Platforms: Linux | BSD
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ifconfig

Configures a network interface.

Links:

ifconfig, freebsd.org
ifconfig, manpages.ubuntu.com

ifdown

Brings a network interface down. See also #ifup.

Links:

iup, ss64.com

ifup

Brings a network interface up. See also #ifdown.

Links:

iup, ss64.com

ping

Sends ICMP packets to network hosts, mostly to see whether they are up.

Examples:

ping www.wikibooks.org

Links:

ping, freebsd.org
6 ping: Packets to network hosts in GNU Inetutils manual, gnu.org
W:ping (networking utility)