NETWORK_NAMESPACES(7)                                                   Linux Programmer's Manual                                                  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, fire‐
       wall 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 termi‐
       nates), its physical network devices are moved back to the initial network namespace (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 network namespaces, and can be used to create
       a bridge to a physical network device in another namespace.  When a namespace is freed, the veth(4) devices that it contains are destroyed.

       Use of network namespaces requires a kernel that is configured 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), ipta‐
       bles(8), ovs-vsctl(8)

Linux                                                                          2020-06-09                                                          NETWORK_NAMESPACES(7)