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.\" ========================================================================
.\"
.IX Title "IPNFW 1"
.TH IPNFW 1 "2016-07-07" "perl v5.24.1" "BP executables"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
ipnfw \- bundle route computation task for the IPN scheme
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
\&\fBipnfw\fR
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBipnfw\fR is a background \*(L"daemon\*(R" task that pops bundles from the queue of
bundle destined for IPN-scheme endpoints, computes proximate destinations
for those bundles, and appends those bundles to the appropriate queues of
bundles pending transmission to those computed proximate destinations.
.PP
For each possible proximate destination (that is, neighboring node) there is
a separate queue for each possible level of bundle priority: 0, 1, 2.  Each
outbound bundle is appended to the queue matching the bundle's designated
priority.
.PP
Proximate destination computation is affected by static and default routes
as configured by \fIipnadmin\fR\|(1) and by contact graphs as managed by \fIionadmin\fR\|(1)
and \fIrfxclock\fR\|(1).
.PP
\&\fBipnfw\fR is spawned automatically by \fBbpadmin\fR in response to the
\&'s' (\s-1START\s0) command that starts operation of Bundle Protocol on the local
\&\s-1ION\s0 node, and it is terminated by \fBbpadmin\fR in response to an 'x' (\s-1STOP\s0)
command.  \fBipnfw\fR can also be spawned and terminated in response to
\&\s-1START\s0 and \s-1STOP\s0 commands that pertain specifically to the \s-1IPN\s0 scheme.
.SH "EXIT STATUS"
.IX Header "EXIT STATUS"
.ie n .IP """0""" 4
.el .IP "``0''" 4
.IX Item "0"
\&\fBipnfw\fR terminated, for reasons noted in the \fBion.log\fR log file.  If this
termination was not commanded, investigate and solve the problem identified
in the log file and use \fBbpadmin\fR to restart \fBipnfw\fR.
.ie n .IP """1""" 4
.el .IP "``1''" 4
.IX Item "1"
\&\fBipnfw\fR could not commence operations, for reasons noted in the \fBion.log\fR
log file.  Investigate and solve the problem identified in the log file, then
use \fBbpadmin\fR to restart \fBipnfw\fR.
.SH "FILES"
.IX Header "FILES"
No configuration files are needed.
.SH "ENVIRONMENT"
.IX Header "ENVIRONMENT"
No environment variables apply.
.SH "DIAGNOSTICS"
.IX Header "DIAGNOSTICS"
The following diagnostics may be issued to the \fBion.log\fR log file:
.IP "ipnfw can't attach to \s-1BP.\s0" 4
.IX Item "ipnfw can't attach to BP."
\&\fBbpadmin\fR has not yet initialized \s-1BP\s0 operations.
.IP "ipnfw can't load routing database." 4
.IX Item "ipnfw can't load routing database."
\&\fBipnadmin\fR has not yet initialized the \s-1IPN\s0 scheme.
.IP "Can't create lists for route computation." 4
.IX Item "Can't create lists for route computation."
An unrecoverable database error was encountered.  \fBipnfw\fR terminates.
.IP "'ipn' scheme is unknown." 4
.IX Item "'ipn' scheme is unknown."
The \s-1IPN\s0 scheme was not added when \fBbpadmin\fR initialized \s-1BP\s0 operations.  Use
\&\fBbpadmin\fR to add and start the scheme.
.IP "Can't take forwarder semaphore." 4
.IX Item "Can't take forwarder semaphore."
\&\s-1ION\s0 system error.  \fBipnfw\fR terminates.
.IP "Can't exclude sender from routes." 4
.IX Item "Can't exclude sender from routes."
An unrecoverable database error was encountered.  \fBipnfw\fR terminates.
.IP "Can't enqueue bundle." 4
.IX Item "Can't enqueue bundle."
An unrecoverable database error was encountered.  \fBipnfw\fR terminates.
.SH "BUGS"
.IX Header "BUGS"
Report bugs to <ion\-bugs@korgano.eecs.ohiou.edu>
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIbpadmin\fR\|(1), \fIipnadmin\fR\|(1), \fIbprc\fR\|(5), \fIipnrc\fR\|(5)