NAME

       mptcpd - multipath TCP daemon

SYNOPSIS

       mptcpd [-d?V] [-l DEST] [--debug] [--addr-flags=FLAGS] [--notify-flags=FLAGS]
              [--plugin-dir=DIR] [--path-manager=PLUGIN] [--load-plugins=PLUGINS] [--help]
              [--usage] [--log=DEST] [--version]

DESCRIPTION

       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.

OPTIONS

       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, and backup 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 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,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

FILES

       /etc/mptcpd/mptcpd.conf
              Location of the mptcpd system configuration file.

REPORTING BUGS

       Report bugs to ⟨mptcp@lists.linux.dev⟩.

SEE ALSO

       ip-mptcp(8)