1.\" $KAME: rtadvd.8,v 1.8 2000/05/22 22:12:11 itojun Exp $ 2.\" 3.\" Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the project nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" $FreeBSD$ 31.\" 32.Dd May 17, 1998 33.Dt RTADVD 8 34.Os 35.Sh NAME 36.Nm rtadvd 37.Nd router advertisement daemon 38.Sh SYNOPSIS 39.Nm 40.Op Fl c Ar configfile 41.Op Fl dDfmRs 42.Ar interface ... 43.Sh DESCRIPTION 44.Nm 45advertises router advertisement packet to the specified 46.Ar interfaces . 47.Pp 48The program will daemonize itself on invocation. 49It will then periodically send router advertisement packets, as well 50as in response to router solicitation messages sent by end hosts. 51.Pp 52Router advertisements can be configured on a per-interface basis, as 53described in 54.Xr rtadvd.conf 5 . 55.Pp 56In the event of no configuration file entry for an interface, 57or if the configuration file does not exist altogether, 58.Nm 59sets all the parameters to their default values. 60In particular, 61.Nm 62reads all the interface routes from the routing table and advertises 63them as on-link prefixes. 64.Pp 65.Nm 66also watches the routing table. 67By default, if an interface direct route is 68added/deleted on an advertising interface and no static prefixes are 69specified by the configuration file, 70.Nm 71adds/deletes the corresponding prefix to/from its advertising list, 72respectively. 73The 74.Ic Fl s 75may be used to disable this behavior. 76Moreover, if the status of an advertising interface changes, 77.Nm 78will start or stop sending router advertisements according 79to the latest status. 80.Pp 81The command line options are: 82.Bl -tag -width indent 83.\" 84.It Fl c 85Specify an alternate location, 86.Ar configfile , 87for the configuration file. 88By default, 89.Pa /etc/rtadvd.conf 90is used. 91.It Fl d 92Print debugging information. 93.It Fl D 94Even more debugging information is printed. 95.It Fl f 96Foreground mode (useful when debugging). 97.It Fl m 98Enables mobile IPv6 support. 99This changes the content of router advertisement option, as well as 100permitted configuration directives. 101.It Fl R 102Accept router renumbering requests. 103If you enable it, certain IPsec setup is suggested for security reasons. 104.It Fl s 105Do not add or delete prefixes dynamically. 106Only statically configured prefixes, if any, will be advertised. 107.El 108.Pp 109Upon receipt of signal 110.Dv SIGUSR1 , 111.Nm 112will dump the current internal state into 113.Pa /var/run/rtadvd.dump. 114.Pp 115Use 116.Dv SIGTERM 117to kill 118.Nm 119gracefully. 120In this case, 121.Nm 122will transmit router advertisement with router lifetime 0 123to all the interfaces 124.Pq according to RFC2461 6.2.5 . 125.Sh RETURN VALUES 126The program exits with 0 on success, and non-zero on failures. 127.Sh FILES 128.Bl -tag -width /etc/rtadvd.conf -compact 129.It Pa /etc/rtadvd.conf 130The default configuration file. 131.It Pa /var/run/rtadvd.pid 132contains pid of the currently running 133.Nm rtadvd . 134.It Pa /var/run/rtadvd.dump 135on which 136.Nm 137dumps its internal state. 138.El 139.Sh SEE ALSO 140.Xr daemon 3 , 141.Xr rtadvd.conf 5 , 142.Xr rtsol 8 143.Sh HISTORY 144The 145.Nm 146command first appeared in WIDE Hydrangea IPv6 protocol stack kit. 147.Sh CAVEAT 148Router advertisements should only be performed downstream. 149Erroneous upstream advertisements will cause 150.Xr icmp6 4 151redirect packet storms in the subnet, as (per the specification) the 152advertising router is assumed to become the default router for 153end hosts in the subnet. 154