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-.\" Copyright (c) 1986, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)XNSrouted.8	8.1 (Berkeley) 6/5/93
-.\"
-.Dd June 5, 1993
-.Dt XNSROUTED 8
-.Os BSD 4.3
-.Sh NAME
-.Nm XNSrouted
-.Nd NS Routing Information Protocol daemon
-.Sh SYNOPSIS
-.Nm XNSrouted
-.Op Fl q
-.Op Fl s
-.Op Fl t
-.Op Ar logfile
-.Sh DESCRIPTION
-.Nm XNSrouted
-is invoked at boot time to manage the Xerox NS routing tables.
-The NS routing daemon uses the Xerox NS Routing
-Information Protocol in maintaining up to date kernel routing
-table entries.
-.Pp
-Available options:
-.Bl -tag -width logfile
-.It Fl q
-Do not supply routing information (opposite of
-.Fl s
-option below).
-.It Fl s
-Forces 
-.Nm XNSrouted
-to supply routing information whether it is acting as an internetwork
-router or not.
-.It Fl t
-All packets sent or received are
-printed on the standard output.  In addition,
-.Nm XNSrouted
-will not divorce itself from the controlling terminal
-so that interrupts from the keyboard will kill the process.
-.It Ar logfile
-Name of file in which 
-.Nm XNSrouted Ns 's
-actions should be logged.  This log contains information
-about any changes to the routing tables and a history of
-recent messages sent and received which are related to
-the changed route.
-.El
-.Pp
-In normal operation
-.Nm XNSrouted
-listens
-for routing information packets.  If the host is connected to
-multiple NS networks, it periodically supplies copies
-of its routing tables to any directly connected hosts
-and networks.
-.Pp
-When
-.Nm XNSrouted
-is started, it uses the
-.Dv SIOCGIFCONF
-.Xr ioctl 2
-to find those
-directly connected interfaces configured into the
-system and marked
-.Dq up
-(the software loopback interface
-is ignored).  If multiple interfaces
-are present, it is assumed the host will forward packets
-between networks.
-.Nm XNSrouted
-then transmits a 
-.Em request
-packet on each interface (using a broadcast packet if
-the interface supports it) and enters a loop, listening
-for
-.Em request
-and
-.Em response
-packets from other hosts.
-.Pp
-When a
-.Em request
-packet is received, 
-.Nm XNSrouted
-formulates a reply based on the information maintained in its
-internal tables.  The
-.Em response
-packet generated contains a list of known routes, each marked
-with a
-.Dq hop count
-metric (a count of 16, or greater, is
-considered
-.Dq infinite ) .
-The metric associated with each
-route returned provides a metric
-.Em relative to the sender .
-.Pp
-.Em Response
-packets received by
-.Nm XNSrouted
-are used to update the routing tables if one of the following
-conditions is satisfied:
-.Bl -bullet
-.It
-No routing table entry exists for the destination network
-or host, and the metric indicates the destination is ``reachable''
-(i.e. the hop count is not infinite).
-.It
-The source host of the packet is the same as the router in the
-existing routing table entry.  That is, updated information is
-being received from the very internetwork router through which
-packets for the destination are being routed.
-.It
-The existing entry in the routing table has not been updated for
-some time (defined to be 90 seconds) and the route is at least
-as cost effective as the current route.
-.It
-The new route describes a shorter route to the destination than
-the one currently stored in the routing tables; the metric of
-the new route is compared against the one stored in the table
-to decide this.
-.El
-.Pp
-When an update is applied,
-.Nm XNSrouted
-records the change in its internal tables and generates a
-.Em response
-packet to all directly connected hosts and networks.
-.Xr Routed 8
-waits a short period
-of time (no more than 30 seconds) before modifying the kernel's
-routing tables to allow possible unstable situations to settle.
-.Pp
-In addition to processing incoming packets,
-.Nm XNSrouted
-also periodically checks the routing table entries.
-If an entry has not been updated for 3 minutes, the entry's metric
-is set to infinity and marked for deletion.  Deletions are delayed
-an additional 60 seconds to insure the invalidation is propagated
-to other routers.
-.Pp
-Hosts acting as internetwork routers gratuitously supply their
-routing tables every 30 seconds to all directly connected hosts
-and networks.
-.Sh SEE ALSO
-.Xr idp 4
-.Rs
-.%T "Internet Transport Protocols"
-.%R "XSIS 028112"
-.%Q "Xerox System Integration Standard"
-.Re
-.Sh HISTORY
-The
-.Nm
-command appeared in
-.Bx 4.3 .