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NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | SEE ALSO | AUTHOR | COLOPHON |
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IP-FOU(8) Linux IP-FOU(8)
ip-fou - Foo-over-UDP receive port configuration
ip-gue - Generic UDP Encapsulation receive port configuration
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
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 contains 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).
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
ip(8)
Tom Herbert <therbert@google.com>
This page is part of the iproute2 (utilities for controlling
TCP/IP networking and traffic) project. Information about the
project can be found at
⟨http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2⟩.
If you have a bug report for this manual page, send it to
netdev@vger.kernel.org, shemminger@osdl.org. This page was
obtained from the project's upstream Git repository
⟨https://git.kernel.org/pub/scm/network/iproute2/iproute2.git⟩ on
2025-08-11. (At that time, the date of the most recent commit
that was found in the repository was 2025-08-08.) If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a
mail to man-pages@man7.org
iproute2 2 Nov 2014 IP-FOU(8)
Pages that refer to this page: ip(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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