NAME [Toc] [Back]
slpd - Service Location Protocol Daemon
SYNOPSIS [Toc] [Back]
slpd [-c configuration_file] [-r registration_file] [-l log_file]
[-p pid_file] [-d]
DESCRIPTION [Toc] [Back]
The slpd daemon provides the functionality of the Directory Agent and
Service Agent for the Service Location Protocol ("SLP") version 2.
SLP provides a scalable framework that allows the networking
applications to discover the existence, location and configuration of
networked services in the enterprise networks.
slpd provides the functionality of the following services:
Directory Agent (DA) [Toc] [Back]
This agent collects service advertisements from the service agents or
applications providing the services and caches them in its memory.
The DA then provides this services information to the clients (user
agents) trying to discover the service information. Directory agents
advertise their presence through directory agent advertisements.
Service Agent Server (SA) [Toc] [Back]
This server registers the service information of all the services that
are advertised by the corresponding service agents to this server. It
then answers the queries from the user agents about the information on
the services that were registered with this server by the services
agents. It also forwards the registrations to any Directory Agents
that may be present in its scope.
slpd also provides a "-r" option whereby the existing services which
are not slp enabled can advertise information by storing this
information in a static registration file. See below for the options.
slpd reads this file and provides the information to the user agents.
slpd can be either started as an SA server or DA by setting
net.slp.isDA to either false or true in the configuration file. In
both the cases, slpd runs as a daemon listening for SLP requests.
When slpd is acting as a DA, it registers the services coming from
within the host acting as a SA server and acts as DA for the User
Agents (UAs) running on the remote machines.
slpd can be configured to provision services within a scope that is
configured by the administrator by setting net.slp.useScopes in the
configuration file. SLP daemon will answer to requests only if it
falls within this scope. This feature of scoping of SLP daemon
provides provisioning of services in an Enterprise network based on
administration needs, geographical needs or department needs and also
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See RFC2608 for more information on the Service Location Protocol.
Without any arguments, slpd reads the default configuration file,
Options [Toc] [Back]
The options are:
-c configuration_file Specifies the configuration file to slpd.
The default configuration file is
-d Do not detach from the terminal.
-l log_file Specifies the log file that receives slpd
log messages. The default log file is
-p pid_file Specifies the file that holds the slpd
process id. The default slpd process id
file is /var/run/slpd.pid.
-r registration_file Specifies the registration file to slpd
for reading service information. The
default registration file is /etc/slp.reg.
To restart the slpd daemon, send it a SIGHUP signal.
To kill the slpd daemon, send it a SIGTERM signal.
The slpdc command can also be used for sending signals to the server
process (see slpdc(1M)).
DIAGNOSTICS [Toc] [Back]
Any errors encountered by slpd in the registration or configuration
file or in normal operation are logged in the log file,
/var/adm/syslog/slpd.log, which is the default file. To change this
log file, use the slpd -l log_file command.
AUTHOR [Toc] [Back]
slpd was developed by the Caldera Systems, Inc.
FILES [Toc] [Back]
/etc/slp.conf SLP configuration file
/etc/slp.reg SLP registration file
/var/run/slpd.pid File storing slpd process ID
/var/log/slp.log Default SLP log file
SEE ALSO [Toc] [Back]
kill(1), slpdc(1M), signal(2), libslp(3N), slp.conf(4), slp.reg(4).
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RFC 2165, RFC 2608, RFC 2609, RFC 2614.
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