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NAME | DESCRIPTION | SEE ALSO | COLOPHON |
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veth(4) Linux Programmer's Manual veth(4)
veth - Virtual Ethernet Device
The veth devices are virtual Ethernet devices. They can act as
tunnels between network namespaces to create a bridge to a physical
network device in another namespace, but can also be used as
standalone network devices.
veth devices are always created in interconnected pairs. A pair can
be created using the command:
# ip link add <p1-name> type veth peer name <p2-name>
In the above, p1-name and p2-name are the names assigned to the two
connected end points.
Packets transmitted on one device in the pair are immediately
received on the other device. When either devices is down the link
state of the pair is down.
veth device pairs are useful for combining the network facilities of
the kernel together in interesting ways. A particularly interesting
use case is to place one end of a veth pair in one network namespace
and the other end in another network namespace, thus allowing commuâ
nication between network namespaces. To do this, one first creates
the veth device as above and then moves one side of the pair to the
other namespace:
# ip link set <p2-name> netns <p2-namespace>
ethtool(8) can be used to find the peer of a veth network interface,
using commands something like:
# ip link add ve_A type veth peer name ve_B # Create veth pair
# ethtool -S ve_A # Discover interface index of peer
NIC statistics:
peer_ifindex: 16
# ip link | grep '^16:' # Look up interface
16: ve_B@ve_A: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc ...
clone(2), network_namespaces(7), ip(8), ip-link(8), ip-netns(8)
This page is part of release 4.15 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/.
Linux 2018-02-02 veth(4)
Pages that refer to this page: clone(2), network_namespaces(7)
Copyright and license for this manual page
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