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Annotation of 43BSDTahoe/man/man8/XNSrouted.8, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1986 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)XNSrouted.8c        6.1 (Berkeley) 6/4/86
        !             6: .\"
        !             7: .TH XNSROUTED 8C "June 4, 1986"
        !             8: .UC 6
        !             9: .SH NAME
        !            10: XNSrouted \- NS Routing Information Protocol daemon
        !            11: .SH SYNOPSIS
        !            12: .B /etc/XNSrouted
        !            13: [
        !            14: .B \-s
        !            15: ] [
        !            16: .B \-q
        !            17: ] [
        !            18: .B \-t
        !            19: ] [
        !            20: .I logfile
        !            21: ]
        !            22: .SH DESCRIPTION
        !            23: .I XNSrouted
        !            24: is invoked at boot time to manage the Xerox NS routing tables.
        !            25: The NS routing daemon uses the Xerox NS Routing
        !            26: Information Protocol in maintaining up to date kernel routing
        !            27: table entries.
        !            28: .PP
        !            29: In normal operation
        !            30: .I XNSrouted
        !            31: listens
        !            32: for routing information packets.  If the host is connected to
        !            33: multiple NS networks, it periodically supplies copies
        !            34: of its routing tables to any directly connected hosts
        !            35: and networks.
        !            36: .PP
        !            37: When
        !            38: .I XNSrouted
        !            39: is started, it uses the SIOCGIFCONF
        !            40: .I ioctl
        !            41: to find those
        !            42: directly connected interfaces configured into the
        !            43: system and marked ``up'' (the software loopback interface
        !            44: is ignored).  If multiple interfaces
        !            45: are present, it is assumed the host will forward packets
        !            46: between networks.
        !            47: .I XNSrouted
        !            48: then transmits a 
        !            49: .I request
        !            50: packet on each interface (using a broadcast packet if
        !            51: the interface supports it) and enters a loop, listening
        !            52: for
        !            53: .I request
        !            54: and
        !            55: .I response
        !            56: packets from other hosts.
        !            57: .PP
        !            58: When a
        !            59: .I request
        !            60: packet is received, 
        !            61: .I XNSrouted
        !            62: formulates a reply based on the information maintained in its
        !            63: internal tables.  The
        !            64: .I response
        !            65: packet generated contains a list of known routes, each marked
        !            66: with a ``hop count'' metric (a count of 16, or greater, is
        !            67: considered ``infinite'').  The metric associated with each
        !            68: route returned provides a metric
        !            69: .IR "relative to the sender" .
        !            70: .PP
        !            71: .I Response
        !            72: packets received by
        !            73: .I XNSrouted
        !            74: are used to update the routing tables if one of the following
        !            75: conditions is satisfied:
        !            76: .TP
        !            77: (1)
        !            78: No routing table entry exists for the destination network
        !            79: or host, and the metric indicates the destination is ``reachable''
        !            80: (i.e. the hop count is not infinite).
        !            81: .TP
        !            82: (2)
        !            83: The source host of the packet is the same as the router in the
        !            84: existing routing table entry.  That is, updated information is
        !            85: being received from the very internetwork router through which
        !            86: packets for the destination are being routed.
        !            87: .TP
        !            88: (3)
        !            89: The existing entry in the routing table has not been updated for
        !            90: some time (defined to be 90 seconds) and the route is at least
        !            91: as cost effective as the current route.
        !            92: .TP
        !            93: (4)
        !            94: The new route describes a shorter route to the destination than
        !            95: the one currently stored in the routing tables; the metric of
        !            96: the new route is compared against the one stored in the table
        !            97: to decide this.
        !            98: .PP
        !            99: When an update is applied,
        !           100: .I XNSrouted
        !           101: records the change in its internal tables and generates a
        !           102: .I response
        !           103: packet to all directly connected hosts and networks.
        !           104: .I Routed
        !           105: waits a short period
        !           106: of time (no more than 30 seconds) before modifying the kernel's
        !           107: routing tables to allow possible unstable situations to settle.
        !           108: .PP
        !           109: In addition to processing incoming packets,
        !           110: .I XNSrouted
        !           111: also periodically checks the routing table entries.
        !           112: If an entry has not been updated for 3 minutes, the entry's metric
        !           113: is set to infinity and marked for deletion.  Deletions are delayed
        !           114: an additional 60 seconds to insure the invalidation is propagated
        !           115: to other routers.
        !           116: .PP
        !           117: Hosts acting as internetwork routers gratuitously supply their
        !           118: routing tables every 30 seconds to all directly connected hosts
        !           119: and networks.
        !           120: .PP
        !           121: Supplying the
        !           122: .B \-s
        !           123: option forces 
        !           124: .I XNSrouted
        !           125: to supply routing information whether it is acting as an internetwork
        !           126: router or not.
        !           127: The
        !           128: .B \-q
        !           129: option is the opposite of the
        !           130: .B \-s
        !           131: option.  If the
        !           132: .B \-t
        !           133: option is specified, all packets sent or received are
        !           134: printed on the standard output.  In addition,
        !           135: .I XNSrouted
        !           136: will not divorce itself from the controlling terminal
        !           137: so that interrupts from the keyboard will kill the process.
        !           138: Any other argument supplied is interpreted as the name
        !           139: of file in which 
        !           140: .IR XNSrouted 's
        !           141: actions should be logged.  This log contains information
        !           142: about any changes to the routing tables and a history of
        !           143: recent messages sent and received which are related to
        !           144: the changed route.
        !           145: .SH "SEE ALSO"
        !           146: ``Internet Transport Protocols'', XSIS 028112, Xerox System Integration
        !           147: Standard.
        !           148: .br
        !           149: idp(4P)

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