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ATMSIGD(8)		     Maintenance Commands		    ATMSIGD(8)

       atmsigd - ATM signaling demon

       atmsigd [-b] [-c config_file] [-d] [-D dump_dir] [-l logfile] [-m mode]
       [-n]   [-q qos]	 [-t trace_length]   [-u uni_version]	[[itf.]vpi.vci
       [input output]]
       atmsigd -V

       atmsigd	implements  the ATM UNI signaling protocol. Requests to estab‐
       lish, accept, or close ATM SVCs are sent from the kernel (using a  com‐
       parably	simple	protocol)  to the signaling demon, which then performs
       the dialog with the network.

       Note that atmsigd is not able to accept or establish connections	 until
       the  local ATM address of the interface is configured by ilmid or manu‐
       ally using atmaddr.

       The default signaling VC (interface 0, VPI 0, VCI 5) can be  overridden
       on the command line by specifying a different PVC address.

       When overriding the default VC, optionally a pair of named pipes to use
       for communicating with the user of signaling  can  be  specified.  Nor‐
       mally,  the kernel is the user of signaling and atmsigd opens a special
       socket for communication with it.

       If atmsigd is killed, all system calls requiring	 interaction  with  it
       will return with an error and set errno to EUNATCH.

       -b     Run  in  background  (i.e. in a forked child process) after ini‐

       -c config_file
	      Use  the	specified  configuration  file	instead	 of  /etc/atm‐
	      sigd.conf	 If  an	 option is specified in the configuration file
	      and on the command line, the command line has priority.

       -d     Enables (lots of) debugging output. By default, atmsigd is  com‐
	      parably quiet.

       -D dump_dir
	      Specifies	 the  directory to which atmsigd will write status and
	      trace dumps. If -D  is  not  specified,  dumps  are  written  to

       -l logfile
	      Write  diagnostic	 messages  to  the specified file. The special
	      name syslog is used to send diagnostics to  the  system  logger,
	      stderr  is  used to send diagnostics to standard error. If -l is
	      absent, the setting in atmsigd.conf is used. If atmsigd  doesn't
	      specify  a  destination either, messages are written to standard

       -m mode
	      Set the mode of operation. The following	modes  are  available:
	      user  for	 the  user side (the default), network for the network
	      side (useful if you have two PCs but no switch), and switch  for
	      operation with a signaling relay in a switch.

       -n     Prints addresses in numeric format only, i.e. no address to name
	      translation is attempted.

       -q qos Configures the signaling VC to use the specified quality of ser‐
	      vice (see qos(7) for the syntax).	 By default, UBR at link speed
	      is used on the signaling VC.

       -t trace_length
	      Sets the number of entries that should be kept in the trace buf‐
	      fer.   -t	 0  disables  tracing. If -t is not specified, atmsigd
	      uses a default of 20 trace entries.

       -u uni_version
	      Sets the signaling mode.	The  following	modes  are  supported:
	      uni30  for  UNI  3.0, uni31 for UNI 3.1, uni31+uni30 for UNI 3.1
	      with 3.0 compatibility, uni40 for UNI  4.0,  and	uni40+q.2963.1
	      for UNI 4.0 with Q.2963.1 peak cell rate renegotiation.

       -V     Prints  the  version  number  of	atmsigd on standard output and

       /etc/atmsigd.conf	default configuration file
				default location of status dumps
				default location of signaling trace dumps

       When receiving a SIGUSR1 signal, atmsigd dumps the list of all internal
       socket  descriptors.  With  SIGUSR2, it dumps the contents of the trace
       buffer. If a dump directory was set, dumps are written to files	called  and, respectively,
       with number starting at zero and being incremented for every  dump.  If
       no dump directory is set, dumps are written to standard error.

       Dumps  are  also	 generated  whenever atmsigd detects a fatal error and
       terminates. No attempt is made to catch signals like SIGSEGV.

       The generation of traces is a comparably slow process which may already
       take  several  seconds for only 100 trace entries.  To generate a trace
       dump, atmsigd therefore forks a child process that runs in parallel  to
       the signaling demon.

       Werner Almesberger, EPFL ICA <>

       atmaddr(8), atmsigd.conf(4), ilmid(8), qos(7)

Linux				April 26, 2000			    ATMSIGD(8)

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