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in.ripngd


NAME
     in.ripngd - network routing daemon for IPv6

SYNOPSIS
     /usr/sbin/in.ripngd  [-s] [-q] [-t] [-p n] [-P] [-v ]
     [logfile]


DESCRIPTION
     in.ripngd is the IPv6 equivalent  of  in.routed(1M).  It  is
     invoked  at  boot time to manage the network routing tables.
     The routing daemon uses the Routing Information Protocol for
     IPv6.

     in.ripngd is managed  by  the  service  management  facility
     (SMF), by means of the service identifier:

       svc:/network/routing/ripng:default



     In normal operation, in.ripngd listens on the udp(7P) socket
     port  521 for routing information packets. If the host is an
     internetwork router, it periodically supplies copies of  its
     routing tables to any directly connected hosts and networks.

     When in.ripngd is started, it uses the SIOCGLIFCONF ioctl(2)
     to  find those directly connected IPv6 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.
     in.ripngd  then  multicasts  a  request  packet on each IPv6
     interface and enters  a  loop,  listening  for  request  and
     response packets from other hosts.

     When a request packet is received,  in.ripngd  formulates  a
     reply  based  on  the information maintained in its internal
     tables. The response packet contains a list of known routes.
     With each route is a number specifying the number of bits in
     the prefix. The prefix is the number of  bits  in  the  high
     order part of an address that indicate the subnet or network
     that the route describes. Each route  reported  also  has  a
     "hop  count"  metric. A count of 16 or greater is considered
     "infinity." The metric associated with each  route  returned
     provides a metric relative to the sender.

     The request packets received by in.ripngd are used to update
     the  routing  tables  if  one of the following conditions is
     satisfied:

         o    No routing table entry exists for  the  destination
              network  or  host,  and  the  metric  indicates the
              destination is "reachable", that is, the hop  count
              is not infinite.

         o    The source host of the packet is the  same  as  the
              router  in  the  existing 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 updated for a period of 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 des-
              tination than the one currently stored in the rout-
              ing tables; this is  determined  by  comparing  the
              metric  of  the new route against the one stored in
              the table.

     When an update is applied, in.ripngd records the  change  in
     its  internal  tables and generates a response packet to all
     directly connected hosts and  networks.  To  allow  possible
     unstable  situations  to  settle,  in.ripngd  waits  a short
     period of time (no more than 30  seconds)  before  modifying
     the kernel's routing tables.

     In addition to processing incoming packets,  in.ripngd  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 throughout the internet.

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

OPTIONS
     in.ripngd supports the options listed below. Listed with the
     options  are  the  equivalent SMF property values. These are
     set for the ripng:default service  with  a  command  of  the
     form:

       # routeadm -m ripng:default key=value



     -p n    Send and receive  the  routing  packets  from  other
             routers  using  the  UDP  port number n. Use of this
             option is equivalent to setting  the  udp_port  pro-
             perty.

     -P      Do not use poison reverse. Use  of  this  option  is
             equivalent to setting the poison_reverse property to
             false.


     -q      Do not  supply  routing  information.  Use  of  this
             option  is equivalent to setting the quiet_mode pro-
             perty to true.


     -s      Force  in.ripngd  to  supply   routing   information
             whether  it  is  acting as an internetwork router or
             not. Use of this option is equivalent to setting the
             supply_routes property to true.


     -t      Print all packets sent or received to standard  out-
             put. in.ripngd will not divorce itself from the con-
             trolling terminal. Accordingly, interrupts from  the
             keyboard will kill the process. Not supported by the
             ripng service.


     -v      Print all changes made  to  the  routing  tables  to
             standard output with a timestamp. Use of this option
             is equivalent to setting  the  verbose  property  to
             true.

             Any other argument supplied to this option is inter-
             preted  as the name of the file in which the actions
             of in.ripngd, as specified by this option or by  -t,
             should  be  logged instead of being sent to standard
             output.

             The logfile can be specified for the  ripng  service
             by means of the log_file property.


ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Availability                | SUNWroute                   |
    |_____________________________|_____________________________|



SEE ALSO
     in.routed(1M), routeadm(1M),  svcadm(1M),  ioctl(2),  attri-
     butes(5), smf(5), udp(7P)

     G. Malkin, R. Minnear, RFC 2080,  RIPng  for  IPv6,  January
     1997.

NOTES
     The kernel's routing tables may not correspond to  those  of
     in.ripngd  for  short  periods  of time while processes that
     utilize existing routes exit; the only remedy for this is to
     place the routing process in the kernel.

     in.ripngd currently does not support all of the  functional-
     ity  of  in.routed(1M).  Future releases may support more if
     appropriate.

     in.ripngd initially obtains a routing table by examining the
     interfaces  configured on a machine. It then sends a request
     on all directly connected networks for more routing informa-
     tion. in.ripngd does not recognize or use any routing infor-
     mation already established on the machine prior to  startup.
     With  the exception of interface changes, in.ripngd does not
     see any routing table changes that have been done  by  other
     programs  on the machine, for example, routes added, deleted
     or flushed by means of  the  route(1M)  command.  Therefore,
     these types of changes should not be done while in.ripngd is
     running. Rather,  shut  down  in.ripngd,  make  the  changes
     required, and then restart in.ripngd.










Man pages from Solaris 10 Update 8. See docs.sun.com and www.oracle.com for further documentation and Solaris information.
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