{
    "name": "ip-gue(8)",
    "mode": "man",
    "parameter": "ip-gue",
    "section": "8",
    "url": "/phpMan.php/man/ip-gue/8/json",
    "generated": "2026-05-27T16:07:34Z",
    "synopsis": "ip [ OPTIONS ] fou  { COMMAND | help }\nip fou add port PORT { gue | ipproto PROTO  } [ local IFADDR  ] [ peer IFADDR  ] [ peerport\nPORT  ] [ dev IFNAME  ]\nip fou del port PORT [ local IFADDR  ] [ peer IFADDR  ] [ peerport PORT  ] [ dev IFNAME  ]",
    "sections": [
        {
            "name": "NAME",
            "level": 1,
            "content": "ip-fou - Foo-over-UDP receive port configuration\n\nip-gue - Generic UDP Encapsulation receive port configuration\n",
            "subsections": []
        },
        {
            "name": "SYNOPSIS",
            "level": 1,
            "content": "ip [ OPTIONS ] fou  { COMMAND | help }\n\nip fou add port PORT { gue | ipproto PROTO  } [ local IFADDR  ] [ peer IFADDR  ] [ peerport\nPORT  ] [ dev IFNAME  ]\nip fou del port PORT [ local IFADDR  ] [ peer IFADDR  ] [ peerport PORT  ] [ dev IFNAME  ]",
            "subsections": [
                {
                    "name": "ip fou show",
                    "level": 2,
                    "content": ""
                }
            ]
        },
        {
            "name": "DESCRIPTION",
            "level": 1,
            "content": "The ip fou commands are used to create and delete receive ports for Foo-over-UDP (FOU) as\nwell as Generic UDP Encapsulation (GUE).\n\nFoo-over-UDP allows encapsulating packets of an IP protocol directly over UDP. The receiver\ninfers the protocol of a packet received on a FOU UDP port to be the protocol configured for\nthe port.\n\nGeneric UDP Encapsulation (GUE) encapsulates packets of an IP protocol within UDP and an en‐\ncapsulation header. The encapsulation header contains the IP protocol number for the encapsu‐\nlated packet.\n\nWhen creating a FOU or GUE receive port, the port number is specified in PORT argument. If\nFOU is used, the IP protocol number associated with the port is specified in PROTO argument.\nYou can bind a port to a local address/interface, by specifying the address in the local\nIFADDR argument or the device in the IFNAME argument. If you would like to connect the port,\nyou can specify the peer address in the peer IFADDR argument and peer port in the peerport\nPORT argument.\n\nA FOU or GUE receive port is deleted by specifying PORT in the delete command, as well as lo‐\ncal address/interface or peer address/port (if set).\n",
            "subsections": []
        },
        {
            "name": "EXAMPLES",
            "level": 1,
            "content": "",
            "subsections": [
                {
                    "name": "Configure a FOU receive port for GRE bound to 7777",
                    "level": 2,
                    "content": "# ip fou add port 7777 ipproto 47\n"
                },
                {
                    "name": "Configure a FOU receive port for IPIP bound to 8888",
                    "level": 2,
                    "content": "# ip fou add port 8888 ipproto 4\n"
                },
                {
                    "name": "Configure a GUE receive port bound to 9999",
                    "level": 2,
                    "content": "# ip fou add port 9999 gue\n"
                },
                {
                    "name": "Delete the GUE receive port bound to 9999",
                    "level": 2,
                    "content": "# ip fou del port 9999\n"
                },
                {
                    "name": "Configure a FOU receive port for GRE bound to 1.2.3.4:7777",
                    "level": 2,
                    "content": "# ip fou add port 7777 ipproto 47 local 1.2.3.4\n"
                },
                {
                    "name": "SEE ALSO",
                    "level": 2,
                    "content": "ip(8)\n"
                }
            ]
        },
        {
            "name": "AUTHOR",
            "level": 1,
            "content": "Tom Herbert <therbert@google.com>\n\n\n\niproute2                                     2 Nov 2014                                    IP-FOU(8)",
            "subsections": []
        }
    ]
}