125 lines
3.5 KiB
HTML
125 lines
3.5 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of NETWORK_NAMESPACES</TITLE>
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</HEAD><BODY>
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<H1>NETWORK_NAMESPACES</H1>
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Section: Linux Programmer's Manual (7)<BR>Updated: 2018-02-02<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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network_namespaces - overview of Linux network namespaces
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<A NAME="lbAC"> </A>
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<H2>DESCRIPTION</H2>
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Network namespaces provide isolation of the system resources associated
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with networking: network devices, IPv4 and IPv6 protocol stacks,
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IP routing tables, firewall rules, the
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<I>/proc/net</I>
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directory (which is a symbolic link to
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<I>/proc/PID/net</I>),
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the
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<I>/sys/class/net</I>
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directory, various files under
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<I>/proc/sys/net</I>,
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port numbers (sockets), and so on.
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In addition,
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network namespaces isolate the UNIX domain abstract socket namespace (see
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<B><A HREF="/cgi-bin/man/man2html?7+unix">unix</A></B>(7)).
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<P>
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A physical network device can live in exactly one
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network namespace.
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When a network namespace is freed
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(i.e., when the last process in the namespace terminates),
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its physical network devices are moved back to the
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initial network namespace (not to the parent of the process).
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<P>
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A virtual network
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(<B><A HREF="/cgi-bin/man/man2html?4+veth">veth</A></B>(4))
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device pair provides a pipe-like abstraction
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that can be used to create tunnels between network namespaces,
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and can be used to create a bridge to a physical network device
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in another namespace.
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When a namespace is freed, the
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<B><A HREF="/cgi-bin/man/man2html?4+veth">veth</A></B>(4)
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devices that it contains are destroyed.
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<P>
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Use of network namespaces requires a kernel that is configured with the
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<B>CONFIG_NET_NS</B>
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option.
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<A NAME="lbAD"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?1+nsenter">nsenter</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?1+unshare">unshare</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?2+clone">clone</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?4+veth">veth</A></B>(4),
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<B><A HREF="/cgi-bin/man/man2html?5+proc">proc</A></B>(5),
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<B><A HREF="/cgi-bin/man/man2html?5+sysfs">sysfs</A></B>(5),
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<B><A HREF="/cgi-bin/man/man2html?7+namespaces">namespaces</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?7+user_namespaces">user_namespaces</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?8+brctl">brctl</A></B>(8),
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<B><A HREF="/cgi-bin/man/man2html?8+ip">ip</A></B>(8),
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<B><A HREF="/cgi-bin/man/man2html?8+ip-address">ip-address</A></B>(8),
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<B><A HREF="/cgi-bin/man/man2html?8+ip-link">ip-link</A></B>(8),
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<B><A HREF="/cgi-bin/man/man2html?8+ip-netns">ip-netns</A></B>(8),
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<B><A HREF="/cgi-bin/man/man2html?8+iptables">iptables</A></B>(8),
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<B><A HREF="/cgi-bin/man/man2html?8+ovs-vsctl">ovs-vsctl</A></B>(8)
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<A NAME="lbAE"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="1"><A HREF="#lbAB">NAME</A><DD>
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<DT id="2"><A HREF="#lbAC">DESCRIPTION</A><DD>
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<DT id="3"><A HREF="#lbAD">SEE ALSO</A><DD>
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<DT id="4"><A HREF="#lbAE">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:06:09 GMT, March 31, 2021
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