# ip-fou(8) - phpMan

[IP-FOU(8)]                            Linux                           [IP-FOU(8)]



**NAME**
       ip-fou - Foo-over-UDP receive port configuration

       ip-gue - Generic UDP Encapsulation receive port configuration

**SYNOPSIS**
       **ip** [ _OPTIONS_ ] **fou**  { _COMMAND_ | **help** }

       **ip** **fou** **add** **port** _PORT_ { **gue** | **ipproto** _PROTO_  } [ **local** _IFADDR_  ] [ **peer**
               _IFADDR_  ] [ **peer**___**port** _PORT_  ] [ **dev** _IFNAME_  ]
       **ip** **fou** **del** **port** _PORT_ [ **local** _IFADDR_  ] [ **peer** _IFADDR_  ] [ **peer**___**port**
               _PORT_  ] [ **dev** _IFNAME_  ]
       **ip** **fou** **show**

**DESCRIPTION**
       The **ip** **fou** commands are used to create and delete receive ports for
       Foo-over-UDP (FOU) as well as Generic UDP Encapsulation (GUE).

       Foo-over-UDP allows encapsulating packets of an IP protocol directly
       over UDP. The receiver infers the protocol of a packet received on a
       FOU UDP port to be the protocol configured for the port.

       Generic UDP Encapsulation (GUE) encapsulates packets of an IP protocol
       within UDP and an encapsulation header. The encapsulation header con-
       tains the IP protocol number for the encapsulated packet.

       When creating a FOU or GUE receive port, the port number is specified
       in _PORT_ argument. If FOU is used, the IP protocol number associated
       with the port is specified in _PROTO_ argument. You can bind a port to a
       local address/interface, by specifying the address in the local _IFADDR_
       argument or the device in the _IFNAME_ argument. If you would like to
       connect the port, you can specify the peer address in the peer _IFADDR_
       argument and peer port in the peer_port _PORT_ argument.

       A FOU or GUE receive port is deleted by specifying _PORT_ in the delete
       command, as well as local address/interface or peer address/port (if
       set).

**EXAMPLES**
   **Configure** **a** **FOU** **receive** **port** **for** **GRE** **bound** **to** **7777**
       # ip fou add port 7777 ipproto 47

   **Configure** **a** **FOU** **receive** **port** **for** **IPIP** **bound** **to** **8888**
       # ip fou add port 8888 ipproto 4

   **Configure** **a** **GUE** **receive** **port** **bound** **to** **9999**
       # ip fou add port 9999 gue

   **Delete** **the** **GUE** **receive** **port** **bound** **to** **9999**
       # ip fou del port 9999

   **Configure** **a** **FOU** **receive** **port** **for** **GRE** **bound** **to** **1.2.3.4:7777**
       # ip fou add port 7777 ipproto 47 local 1.2.3.4

**SEE** **ALSO**
       [**ip**(8)]

**AUTHOR**
       Tom Herbert <<therbert@google.com>>



iproute2                          2 Nov 2014                         [IP-FOU(8)]