NETWORK_NAMESPACES(7)     (2020-06-09)      NETWORK_NAMESPACES(7)

     NAME
          network_namespaces - overview of Linux network namespaces

     DESCRIPTION
          Network namespaces provide isolation of the system resources
          associated with networking: network devices, IPv4 and IPv6
          protocol stacks, IP routing tables, firewall rules, the
          /proc/net directory (which is a symbolic link to
          /proc/PID/net), the /sys/class/net directory, various files
          under /proc/sys/net, port numbers (sockets), and so on.  In
          addition, network namespaces isolate the UNIX domain
          abstract socket namespace (see unix(7)).

          A physical network device can live in exactly one network
          namespace.  When a network namespace is freed (i.e., when
          the last process in the namespace terminates), its physical
          network devices are moved back to the initial network names-
          pace (not to the parent of the process).

          A virtual network (veth(4)) device pair provides a pipe-like
          abstraction that can be used to create tunnels between net-
          work namespaces, and can be used to create a bridge to a
          physical network device in another namespace.  When a names-
          pace is freed, the veth(4) devices that it contains are
          destroyed.

          Use of network namespaces requires a kernel that is config-
          ured with the CONFIG_NET_NS option.

     SEE ALSO
          nsenter(1), unshare(1), clone(2), veth(4), proc(5),
          sysfs(5), namespaces(7), user_namespaces(7), brctl(8),
          ip(8), ip-address(8), ip-link(8), ip-netns(8), iptables(8),
          ovs-vsctl(8)

     COLOPHON
          This page is part of release 5.10 of the Linux man-pages
          project.  A description of the project, information about
          reporting bugs, and the latest version of this page, can be
          found at https://www.kernel.org/doc/man-pages/.

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