VETH(4)                   (2020-11-01)                    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 immedi-
          ately 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 communication
          between network namespaces.  To do this, one can provide the
          netns parameter 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

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

          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 aqha16:aq   # 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),

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     VETH(4)                   (2020-11-01)                    VETH(4)

          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

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