193 lines
6.1 KiB
Groff
193 lines
6.1 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 N
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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 N
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Do not reply on GetNearestServer SAP request.
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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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.Pp
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If
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.Nm IPXrouted
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receives a SIGINFO signal the current contents of the RIP and SAP
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tables are appended to the file /tmp/ipxrouted.dmp.
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.Sh SEE ALSO
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.Xr ipx 3
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.Sh HISTORY
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