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+.\" Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the project nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     $Id: rtadvd.8,v 1.1.1.1 1999/08/08 23:31:42 itojun Exp $
+.\"     $FreeBSD$
+.\"
+.Dd May 17, 1998
+.Dt RTADVD 8
+.Os KAME
+.Sh NAME
+.Nm rtadvd
+.Nd router advertisement daemon
+.Sh SYNOPSIS
+.Nm
+.Op Fl c Ar configfile
+.Op Fl P Ar policy
+.Op Fl dDfs
+.Ar interface ...
+.Sh DESCRIPTION
+.Nm Rtadvd
+advertises router advertisement packet to the specified
+.Ar interfaces .
+.Pp
+The program will daemonize itself on invocation.
+Then, it will voluntarily send router advertisement packet periodically.
+If a router solicitation packet from host has reached the program,
+the program will respond by router advertisement packet.
+.Pp
+For each interface, which is called advertising interface,
+content of router advertisement can be described in
+.Xr rtadvd.conf 5 .
+.Pp
+If there is no description for the interface in the configuration file
+or if the configuration file does not exist,
+.Nm
+sets all the parameters to their default values.
+In particular,
+.Nm
+gets all the interface routes from the routing table and advertises
+them as on-link prefixes.
+.Pp
+.Nm Rtadvd
+watches the routing table.
+By default, if an interface direct route is
+added/deleted on an advertising interface,
+.Nm
+adds/deletes the corresponding prefix to/from its advertising list,
+respectively.
+If you do not want to enable this feature, you should specify the
+.Ic Fl s
+command line option when advocation.
+.Pp
+.Nm Rtadvd
+can also receive router renumbering packets, and can do router
+renumbering for the system it runs on, as the contents of those
+packets.
+.Bl -tag -width indent
+.\"
+.It Fl c
+Specify an alternate location,
+.Ar configfile ,
+for the configuration file.
+By default,
+.Pa /usr/local/v6/etc/rtadvd.conf
+is used.
+.It Fl P
+Specifies that
+.Nm
+receives router renumbering messages. Also, specifies IPsec policy for
+rrenumd sessions. Because router renumbering can change the system's
+IPv6 prefix, its messages must be protected by IPsec. For details about
+.Ar policy ,
+please refer to
+.Xr ipsec 4
+and
+.Xr ipsec_set_policy 3 .
+.It Fl d
+Debug.
+.It Fl D
+More debug.
+.It Fl f
+Foreground mode.
+Do not become daemon.
+.It Fl s
+Static prefix.
+Do not watch the routing table.
+.El
+.Sh RETURN VALUES
+The program exits with 0 on success, and non-zero on failures.
+.Sh FILES
+.Bl -tag -width /usr/local/v6/etc/rtadvd.conf -compact
+.It Pa /usr/local/v6/etc/rtadvd.conf
+The default configuration file.
+.El
+.Sh SEE ALSO
+.Xr daemon 3 ,
+.Xr rtadvd.conf 5 ,
+.Xr rtsol 8
+.Sh HISTORY
+The
+.Nm
+command first appeared in WIDE Hydrangea IPv6 protocol stack kit.
+.Sh CAVEAT
+Do not perform router advertisement toward upstream direction,
+you should only advertise to downstream direction.
+If you advertise toward upstream by mistake,
+you will see icmp6 redirect storm on that subnet.
+This is because of the specification,
+which says that advertising router is assumed to become
+the default outgoing router for end hosts in the subnet.