BSD 2.11 - man page for xnsrouted (bsd section 8)

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XNSROUTED(8)									     XNSROUTED(8)

       XNSrouted - NS Routing Information Protocol daemon

       /sbin/XNSrouted [ -s ] [ -q ] [ -t ] [ logfile ]

       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.

       In  normal  operation  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.

       When  XNSrouted is started, it uses the SIOCGIFCONF ioctl to find those directly connected
       interfaces configured into the system and marked ``up'' (the software  loopback	interface
       is  ignored).   If  multiple  interfaces  are present, it is assumed the host will forward
       packets between networks.  XNSrouted then transmits a request  packet  on  each	interface
       (using  a  broadcast packet if the interface supports it) and enters a loop, listening for
       request and response packets from other hosts.

       When a request packet is received, XNSrouted formulates a reply based on  the  information
       maintained in its internal tables.  The response packet generated contains a list of known
       routes, each marked with a ``hop count'' metric (a count of 16, or greater, is  considered
       ``infinite'').	The metric associated with each route returned provides a metric relative
       to the sender.

       Response packets received by XNSrouted are used to update the routing tables if one of the
       following conditions is satisfied:(1)    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).

       (2)    The source host of the packet is the same as the router in the existing routing ta-
	      ble  entry.  That is, updated information is being received from the very internet-
	      work router through which packets for the destination are being routed.(3)    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.(4)    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.

       When  an update is applied, XNSrouted records the change in its internal tables and gener-
       ates a response packet to all directly connected hosts and networks.  Routed 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.

       In addition to processing incoming packets, 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.

       Hosts  acting  as  internetwork	routers gratuitously supply their routing tables every 30
       seconds to all directly connected hosts and networks.

       Supplying the -s option forces XNSrouted to supply routing information whether it is  act-
       ing as an internetwork router or not.  The -q option is the opposite of the -s option.  If
       the -t option is specified, all packets sent or received are printed on the standard  out-
       put.  In addition, XNSrouted will not divorce itself from the controlling terminal so that
       interrupts from the keyboard will kill the process.  Any other argument supplied is inter-
       preted  as  the name of file in which XNSrouted's actions should be logged.  This log con-
       tains information about any changes to the routing tables and a history of recent messages
       sent and received which are related to the changed route.

       ``Internet Transport Protocols'', XSIS 028112, Xerox System Integration Standard.

4.3 Berkeley Distribution		 November 1, 1996			     XNSROUTED(8)
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