diff options
Diffstat (limited to 'usr.sbin/rtadvd/rtadvd.8')
| -rw-r--r-- | usr.sbin/rtadvd/rtadvd.8 | 45 |
1 files changed, 36 insertions, 9 deletions
diff --git a/usr.sbin/rtadvd/rtadvd.8 b/usr.sbin/rtadvd/rtadvd.8 index 3ddc77d..dcdcdab 100644 --- a/usr.sbin/rtadvd/rtadvd.8 +++ b/usr.sbin/rtadvd/rtadvd.8 @@ -1,5 +1,5 @@ .\" $FreeBSD$ -.\" $KAME: rtadvd.8,v 1.9 2000/05/27 13:37:01 jinmei Exp $ +.\" $KAME: rtadvd.8,v 1.17 2001/02/04 05:34:38 jinmei Exp $ .\" .\" Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. .\" All rights reserved. @@ -36,8 +36,8 @@ .Nd router advertisement daemon .Sh SYNOPSIS .Nm +.Op Fl dDfMRs .Op Fl c Ar configfile -.Op Fl dDfRs .Ar interface ... .Sh DESCRIPTION .Nm @@ -77,6 +77,15 @@ Moreover, if the status of an advertising interface changes, will start or stop sending router advertisements according to the latest status. .Pp +Basically, hosts MUST NOT send Router Advertisement messages at any +time (RFC 2461, Section 6.2.3). +However, it would sometimes be useful to allow hosts to advertise some +parameters such as prefix information and link MTU. +Thus, +.Nm +can be invoked if router lifetime is explicitly set zero on every +advertising interface. +.Pp The command line options are: .Bl -tag -width indent .\" @@ -93,6 +102,15 @@ Print debugging information. Even more debugging information is printed. .It Fl f Foreground mode (useful when debugging). +.It Fl M +Specify an interface to join the all-routers site-local multicast group. +By default, +.Nm +tries to join the first advertising interface appeared in the command +line. +This option has meaning only with the +.Fl R +option, which enables routing renumbering protocol support. .\".It Fl m .\"Enables mobile IPv6 support. .\"This changes the content of router advertisement option, as well as @@ -100,6 +118,12 @@ Foreground mode (useful when debugging). .It Fl R Accept router renumbering requests. If you enable it, certain IPsec setup is suggested for security reasons. +On KAME-based systems, +.Xr rrenumd 8 +generates router renumbering request packets. +This option is currently disabled, and is ignored by +.Nm +with a warning message. .It Fl s Do not add or delete prefixes dynamically. Only statically configured prefixes, if any, will be advertised. @@ -138,17 +162,20 @@ in which dumps its internal state. .El .Sh SEE ALSO -.Xr daemon 3 , .Xr rtadvd.conf 5 , -.Xr rtsol 8 +.Xr rtsol 8 , +.Xr rrenumd 8 .Sh HISTORY The .Nm command first appeared in WIDE Hydrangea IPv6 protocol stack kit. .Sh CAVEAT -Router advertisements should only be performed downstream. -Erroneous upstream advertisements will cause +There used to be some text that recommended users not to let +.Nm +advertise Router Advertisement messages on an upstream link to avoid +undesirable .Xr icmp6 4 -redirect packet storms in the subnet, as (per the specification) the -advertising router is assumed to become the default router for -end hosts in the subnet. +redirect messages. +However, based on the later discussion in the IETF ipng working group, +all routers should rather advertise the messages regardless of +the network topology, in order to ensure reachability. |
