VETH(4) - phpMan

VETH(4)                             Linux Programmer's Manual                             VETH(4)

NAME
       veth - Virtual Ethernet Device

DESCRIPTION
       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  de-
       vice.  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 allow-
       ing communication between network namespaces.  To do this, one can provide the  netns  pa-
       rameter when creating the interfaces:

           # ip link add <p1-name> netns <p1-ns> type veth peer <p2-name> netns <p2-ns>

       or, for an existing veth pair, move one side to the other namespace:

           # ip link set <p2-name> netns <p2-ns>

       ethtool(8)  can be used to find the peer of a veth network interface, using commands some-
       thing 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 ...

SEE ALSO
       clone(2), network_namespaces(7), ip(8), ip-link(8), ip-netns(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/.

Linux                                       2020-11-01                                    VETH(4)

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