mptcpd - Man Page

mptcpd is a daemon for Linux based operating systems that performs multipath TCP (see IETF RFC 8684) path management related operations in the user space.  It interacts with the Linux kernel through a generic netlink connection to track per-connection information, available network interfaces, request new MPTCP subflows, handle requests for subflows, etc.

mptcpd accepts the following command line options:

-d,--debug

enable debug log messages

-?,--help

display mptcpd help information

--usage

display brief mptcpd usage information

-l DEST, --log=DEST

log output to DEST, where DEST can be stderr, syslog or journal

--addr-flags=FLAGS

set flags for announced address, where FLAGS is a comma separated list containing one or more of the flags subflow, signal, backup, and fullmesh that plugins that deal with the in-kernel path manager may use when advertising addresses, e.g. --addr-flags=subflow

--notify-flags=FLAGS

address notification flags, where FLAGS is a comma separated list containing one or more of the following flags:

existing

notify plugins of the addresses that exist at mptcpd start

skip_link_local

ignore (do not notify) [ipv6] link local address updates

skip_loopback

ignore (do not notify) host (loopback) address updates

check_route

notify address only if a default route is available from such address and the related device. If the route check fails, it will be re-done after a little timeout, to allow e.g. DHCP to configure the host properly. Complex policy routing configuration may confuse or circumvent this check.

These flags determine whether mptpcd plugins will be notified when related addresses are updated, e.g. --notify-flags=existing,skip_link_local,skip_loopback,check_route

--plugin-dir=DIR

set plugin directory to DIR

--path-manager=PLUGIN

set default path manager plugin to PLUGIN, overriding plugin priorities

--load-plugins=PLUGINS

set plugins to load on startup, where PLUGINS is a comma separated list containing one or more plugin names

-V,--version

display mptcpd version information

/etc/mptcpd/mptcpd.conf

Location of the mptcpd system configuration file.

Report bugs to mptcp@lists.linux.dev.

ip-mptcp(8)

mptcpd_selinux(8), mptcpize(8).