ipxrouted(8)

NAME

IPXrouted - IPX Routing Information Protocol daemon

SYNOPSIS

IPXrouted [-N] [-q] [-s] [-S] [-t] [logfile]

DESCRIPTION

The IPXrouted utility is invoked at boot time to manage the
IPX routing
tables. The IPX routing daemon uses the Novell IPX Routing
Information
Protocol in maintaining up to date kernel routing table en
tries.
Available options:
-N Do not reply on GetNearestServer SAP request.
-q Do not supply routing information (opposite of -s
option below).
-s Forces IPXrouted to supply routing information
whether it is
acting as an internetwork router or not.
-S Do not supply Service Advertising Protocol (SAP)
information.
The default is to supply SAP information.
-t All packets sent or received are printed on the
standard output.
In addition, IPXrouted will not divorce itself from
the controlling terminal so that interrupts from the keyboard
will kill the
process.
logfile Name of file in which IPXrouted'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.
In normal operation IPXrouted listens for routing informa
tion packets.
If the host is connected to multiple IPX networks, it peri
odically supplies copies of its routing tables to any directly connected
hosts and
networks.
When IPXrouted is started, it uses the SIOCGIFCONF ioctl(2)
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 pack
ets between
networks. The IPXrouted utility then transmits a request
packet on each
interface (using a broadcast packet if the interface sup
ports it) and
enters a loop, listening for request and response packets
from other
hosts.
When a request packet is received, IPXrouted 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 IPXrouted are used to update
the routing
tables if one of the following conditions is satisfied:
+o No routing table entry exists for the destination net
work or host,
and the metric indicates the destination is ``reach
able'' (i.e., the
hop count is not infinite).
+o The source host of the packet is the same as the router
in the exist
ing routing table entry. That is, updated information
is being
received from the very internetwork router through which
packets for
the destination are being routed.
+o The existing entry in the routing table has not been up
dated for some
time (defined to be 90 seconds) and the route is at
least as cost
effective as the current route.
+o The new route describes a shorter route to the destina
tion 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, IPXrouted records the change in
its internal
tables and generates a response packet to all directly con
nected hosts
and networks. The routed(8) utility 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, IPXrouted 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.
If IPXrouted receives a SIGINFO signal the current contents
of the RIP
and SAP tables are appended to the file
/var/log/ipxrouted.dmp.

SEE ALSO

ipx(3)

HISTORY

The IPXrouted utility first appeared in FreeBSD 2.2.
BSD October 11, 1995
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