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NAME | SYNOPSIS | DESCRIPTION | AUTHOR | COLOPHON |
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IP-MPTCP(8) Linux IP-MPTCP(8)
ip-mptcp - MPTCP path manager configuration
ip [ OPTIONS ] mptcp { endpoint | limits | help }
ip mptcp endpoint add IFADDR [ port PORT ] [ dev IFNAME ] [ id ID
] [ FLAG-LIST ]
ip mptcp endpoint delete id ID [ IFADDR ]
ip mptcp endpoint change [ id ID ] [ IFADDR ] [ port PORT ]
CHANGE-OPT
ip mptcp endpoint show [ id ID ]
ip mptcp endpoint flush
FLAG-LIST := [ FLAG-LIST ] FLAG
FLAG := [ signal | subflow | backup | fullmesh ]
CHANGE-OPT := [ backup | nobackup | fullmesh | nofullmesh ]
ip mptcp limits set [ subflow SUBFLOW_NR ] [ add_addr_accepted
ADD_ADDR_ACCEPTED_NR ]
ip mptcp limits show
ip mptcp monitor
MPTCP is a transport protocol built on top of TCP that allows TCP
connections to use multiple paths to maximize resource usage and
increase redundancy. The ip-mptcp sub-commands allow configuring
several aspects of the MPTCP path manager, which is in charge of
subflows creation:
The endpoint object specifies the IP addresses that will be used
and/or announced for additional subflows:
ip mptcp endpoint add add new MPTCP endpoint
ip mptcp endpoint delete delete existing MPTCP endpoint
ip mptcp endpoint show get existing MPTCP endpoint
ip mptcp endpoint flush flush all existing MPTCP endpoints
IFADDR An IPv4 or IPv6 address. When used with the delete id
operation, an IFADDR is only included when the ID is 0.
PORT When a port number is specified, incoming MPTCP subflows
for already established MPTCP sockets will be accepted on
the specified port, regardless the original listener port
accepting the first MPTCP subflow and/or this peer being
actually on the client side.
ID is a unique numeric identifier for the given endpoint
signal The endpoint will be announced/signaled to each peer via
an MPTCP ADD_ADDR sub-option. Upon reception of an
ADD_ADDR sub-option, the peer can try to create additional
subflows, see ADD_ADDR_ACCEPTED_NR.
subflow
If additional subflow creation is allowed by the MPTCP
limits, the MPTCP path manager will try to create an
additional subflow using this endpoint as the source
address after the MPTCP connection is established.
backup If this is a subflow endpoint, the subflows created using
this endpoint will have the backup flag set during the
connection process. This flag instructs the peer to only
send data on a given subflow when all non-backup subflows
are unavailable. This does not affect outgoing data, where
subflow priority is determined by the backup/non-backup
flag received from the peer
fullmesh
If this is a subflow endpoint and additional subflow
creation is allowed by the MPTCP limits, the MPTCP path
manager will try to create an additional subflow for each
known peer address, using this endpoint as the source
address. This will occur after the MPTCP connection is
established. If the peer did not announce any additional
addresses using the MPTCP ADD_ADDR sub-option, this will
behave the same as a plain subflow endpoint. When the peer
does announce addresses, each received ADD_ADDR sub-option
will trigger creation of an additional subflow to generate
a full mesh topology.
implicit
In some scenarios, an MPTCP subflow can use a local
address mapped by a implicit endpoint created by the in-
kernel path manager. Once set, the implicit flag cannot be
removed, but other flags can be added to the endpoint.
Implicit endpoints cannot be created from user-space.
The limits object specifies the constraints for subflow
creations:
ip mptcp limits show get current MPTCP subflow creation limits
ip mptcp limits set change the MPTCP subflow creation limits
SUBFLOW_NR
specifies the maximum number of additional subflows
allowed for each MPTCP connection. Additional subflows can
be created due to: incoming accepted ADD_ADDR sub-option,
local subflow endpoints, additional subflows started by
the peer.
ADD_ADDR_ACCEPTED_NR
specifies the maximum number of incoming ADD_ADDR sub-
options accepted for each MPTCP connection. After
receiving the specified number of ADD_ADDR sub-options,
any other incoming one will be ignored for the MPTCP
connection lifetime. When an ADD_ADDR sub-option is
accepted and there are no local fullmesh endpoints, the
MPTCP path manager will try to create a new subflow using
the address in the ADD_ADDR sub-option as the destination
address and a source address determined using local
routing resolution When fullmesh endpoints are available,
the MPTCP path manager will try to create new subflows
using each fullmesh endpoint as a source address and the
peer's ADD_ADDR address as the destination. In both cases
the SUBFLOW_NR limit is enforced.
monitor displays creation and deletion of MPTCP connections as
well as addition or removal of remote addresses and subflows.
Original Manpage by Paolo Abeni <[email protected]>
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
[email protected], [email protected]. This page was
obtained from the project's upstream Git repository
⟨https://git.kernel.org/pub/scm/network/iproute2/iproute2.git⟩ on
2024-06-14. (At that time, the date of the most recent commit
that was found in the repository was 2024-06-11.) 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 [email protected]
iproute2 4 Apr 2020 IP-MPTCP(8)
Pages that refer to this page: ip(8)
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HTML rendering created 2024-06-26 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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