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486f715f83
Submitted by: john Hay (John.Hay@csir.co.za) John's IPXrouted.. this has not yet been seen to run correctly with Mike's IPX/SPX code (he has his own) bringing them both in is the first step in merging the two packages for 2.2
185 lines
6.0 KiB
Groff
185 lines
6.0 KiB
Groff
.\" Copyright (c) 1986, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Copyright (c) 1995 John Hay. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd Oct 11, 1995
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.Dt IPXROUTED 8
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.Os FreeBSD
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.Sh NAME
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.Nm IPXrouted
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.Nd IPX Routing Information Protocol daemon
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.Sh SYNOPSIS
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.Nm IPXrouted
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.Op Fl q
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.Op Fl s
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.Op Fl S
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.Op Fl t
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.Op Ar logfile
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.Sh DESCRIPTION
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.Nm IPXrouted
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is invoked at boot time to manage the IPX routing tables.
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The IPX routing daemon uses the Novell IPX Routing
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Information Protocol in maintaining up to date kernel routing
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table entries.
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.Pp
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Available options:
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.Bl -tag -width logfile
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.It Fl q
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Do not supply routing information (opposite of
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.Fl s
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option below).
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.It Fl s
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Forces
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.Nm IPXrouted
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to supply routing information whether it is acting as an internetwork
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router or not.
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.It Fl S
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Do not supply Service Advertizing Protocol
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.Nm (SAP)
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information. The default is to supply
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.Nm SAP
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information.
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.It Fl t
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All packets sent or received are
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printed on the standard output. In addition,
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.Nm IPXrouted
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will not divorce itself from the controlling terminal
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so that interrupts from the keyboard will kill the process.
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.It Ar logfile
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Name of file in which
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.Nm IPXrouted Ns 's
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actions should be logged. This log contains information
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about any changes to the routing tables and a history of
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recent messages sent and received which are related to
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the changed route.
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.El
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.Pp
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In normal operation
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.Nm IPXrouted
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listens
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for routing information packets. If the host is connected to
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multiple IPX networks, it periodically supplies copies
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of its routing tables to any directly connected hosts
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and networks.
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.Pp
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When
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.Nm IPXrouted
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is started, it uses the
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.Dv SIOCGIFCONF
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.Xr ioctl 2
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to find those
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directly connected interfaces configured into the
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system and marked
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.Dq up
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(the software loopback interface
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is ignored). If multiple interfaces
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are present, it is assumed the host will forward packets
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between networks.
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.Nm IPXrouted
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then transmits a
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.Em request
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packet on each interface (using a broadcast packet if
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the interface supports it) and enters a loop, listening
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for
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.Em request
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and
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.Em response
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packets from other hosts.
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.Pp
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When a
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.Em request
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packet is received,
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.Nm IPXrouted
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formulates a reply based on the information maintained in its
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internal tables. The
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.Em response
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packet generated contains a list of known routes, each marked
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with a
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.Dq hop count
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metric (a count of 16, or greater, is
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considered
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.Dq infinite ) .
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The metric associated with each
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route returned provides a metric
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.Em relative to the sender .
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.Pp
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.Em Response
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packets received by
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.Nm IPXrouted
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are used to update the routing tables if one of the following
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conditions is satisfied:
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.Bl -bullet
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.It
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No routing table entry exists for the destination network
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or host, and the metric indicates the destination is ``reachable''
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(i.e. the hop count is not infinite).
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.It
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The source host of the packet is the same as the router in the
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existing routing table entry. That is, updated information is
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being received from the very internetwork router through which
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packets for the destination are being routed.
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.It
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The existing entry in the routing table has not been updated for
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some time (defined to be 90 seconds) and the route is at least
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as cost effective as the current route.
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.It
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The new route describes a shorter route to the destination than
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the one currently stored in the routing tables; the metric of
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the new route is compared against the one stored in the table
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to decide this.
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.El
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.Pp
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When an update is applied,
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.Nm IPXrouted
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records the change in its internal tables and generates a
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.Em response
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packet to all directly connected hosts and networks.
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.Xr Routed 8
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waits a short period
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of time (no more than 30 seconds) before modifying the kernel's
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routing tables to allow possible unstable situations to settle.
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.Pp
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In addition to processing incoming packets,
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.Nm IPXrouted
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also periodically checks the routing table entries.
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If an entry has not been updated for 3 minutes, the entry's metric
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is set to infinity and marked for deletion. Deletions are delayed
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an additional 60 seconds to insure the invalidation is propagated
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to other routers.
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.Pp
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Hosts acting as internetwork routers gratuitously supply their
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routing tables every 30 seconds to all directly connected hosts
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and networks.
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.Sh SEE ALSO
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.Xr ipx 4
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.Sh HISTORY
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