proacd(8)                       ProL2TP Manual                       proacd(8)



NAME
       proacd - ProL2TP Access Concentrator Daemon

SYNOPSIS
       proacd [-h] [-v] [-f] [-c config] [-l license] [-n] [-o output] [-D]
       [-d debugmask] [-L facility]

DESCRIPTION
       proacd is a PPP Access Concentrator, designed to route PPP traffic from
       remote  clients  to  remote  access  servers.  At this time, only PPPoE
       clients are supported.

       User PPP traffic may be routed through L2TP tunnels, or  terminated  by
       local pppd instances.

       For  L2TP  routes, proacd interfaces with prol2tpd to create and delete
       L2TP tunnels as required.  The data path for PPPoE to  L2TP  routes  is
       handled  entirely  within  the kernel, giving the best possible perfor-
       mance.  The kernel module l2tp_ac_pppoe is required by proacd  to  com-
       plete these routes.

OPTIONS
       -h      Display usage information.

       -v      Display version information.

       -f      Run in the foreground. By default, proacd forks itself and runs
               in the background. For debugging, it is sometimes useful to run
               the  application  in  the foreground. Note that when run in the
               foreground, daemon output messages are sent to the  controlling
               terminal rather than to syslog.

       -c config
               Read configuration commands from the specified file rather than
               the default path.


       -n      Checks the config file for correctness and outputs the  result-
               ing configuration information. Exits after reading the configu-
               ration.

       -o output
               Send daemon output to the specified filename, rather than  sys-
               log.

       -D      Enable daemon debugging messages.

       -d debugmask
               Configures the debug message mask. The mask may be specified as
               a decimal or hexadecimal integer or as a  comma-separated  list
               of  debug  modules. Valid debug modules are route, pppoe, l2tp,
               radius, ppp, pppfsm, lcpfsm,  ctrl,  trace,  pppd,  system  and
               parser. The special mask all enables debugging in all modules.

       -L facility
               If  logging  to  syslog, this option can be used to specify the
               syslog facility to be used. Valid values are local0 ..  local7,
               or  default.  The value "local0" corresponds to LOG_LOCAL0. The
               default is LOG_DAEMON.

OPERATION
       proacd negotiates and accepts client connections and opens a connection
       to the server based on the route definitions specified in it's configu-
       ration file.  The client connection is referred to as the  source  end-
       point  and  the  server connection is referred to destination endpoint.
       The relationship between source endpoint and  destination  endpoint  is
       referred to as a route.

CONFIGURATION
       The  config  file  is read at startup and when proacd receives a SIGHUP
       signal.

PROTOCOLS
       proacd currently supports only PPPoE as a source endpoint and both L2TP
       and  PPP  as  destination  endpoints.  It also supports querying RADIUS
       servers to make authentication and  routing  decisions  about  incoming
       client  session setup requests.  It fully implements the server side of
       RFC 2516 (A Method for Transmitting PPP Over Ethernet), to  listen  for
       incoming service requests.

       proacd  requires  an external L2TP daemon, prol2tpd, in order to estab-
       lish L2TP destination endpoints. An external PPP daemon, either propppd
       or the legacy pppd, is required to terminate PPP sessions locally.

LINUX KERNEL DRIVERS
       In  order  to  switch data packets from an incoming PPPoE session to an
       L2TP session, proacd requires that the linux kernel driver  l2tp_ac_pp-
       poe  is  loaded.   This driver should have been provided along with the
       distribution of proacd you received.

       proacd is able to terminate incoming sessions in a local pppd instance,
       to  do so it makes use of the rp-pppoe.so plugin distributed with pppd,
       which requires that the linux kernel driver pppoe is loaded.

MANAGEMENT INTERFACE
       A management interface is provided to allow users  or  applications  to
       query  the status of the daemon.  It uses the netlink protocol familiar
       to kernel programmers, using an AF_UNIX socket attached to a named pipe
       for  transport.  An example application proac_info is provided to allow
       the user to dump the list of current routes and the set  of  statistics
       kept by the daemon.

SEE ALSO
       proacd.conf(5), proac_info(8), proac_trace(8), proac_manage(8),



ProL2TP 2.1.0                     August 2020                        proacd(8)