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 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), iptables(8), ovs-vsctl(8)

Information

Source
Linux kernel
OS/version
Linux
Source updated
February 2, 2018
Page created
February 9, 2018
Page generated
December 2, 2018