.\"	$OpenBSD: route6d.8,v 1.28 2023/03/04 12:02:07 jmc Exp $
.\"	$KAME: route6d.8,v 1.11 2002/06/02 15:00:30 itojun Exp $
.\"
.\" Copyright (c) 1996 WIDE Project. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modifications, are permitted provided that the above copyright notice
.\" and this paragraph are duplicated in all such forms and that any
.\" documentation, advertising materials, and other materials related to
.\" such distribution and use acknowledge that the software was developed
.\" by the WIDE Project, Japan. The name of the Project may not be used to
.\" endorse or promote products derived from this software without
.\" specific prior written permission. THIS SOFTWARE IS PROVIDED ``AS IS''
.\" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
.\" LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
.\" A PARTICULAR PURPOSE.
.\"
.Dd $Mdocdate: March 4 2023 $
.Dt ROUTE6D 8
.Os
.Sh NAME
.Nm route6d
.Nd Routing Information Protocol (RIP) for IPv6 daemon
.Sh SYNOPSIS
.Nm route6d
.Op Fl aDdhlnqSsu
.Sm off
.Op Fl A No \~ Ar prefix No / Ar preflen , Ar if1 Op , Ar if2 , ...
.Sm on
.Sm off
.Op Fl L No \~ Ar prefix No / Ar preflen , Ar if1 Op , Ar if2 , ...
.Sm on
.Sm off
.Op Fl N No \~ Ar if1 Op , Ar if2 , ...
.Sm on
.Sm off
.Op Fl O No \~ Ar prefix No / Ar preflen , Ar if1 Op , Ar if2 , ...
.Sm on
.Sm off
.Op Fl T No \~ Ar if1 Op , Ar if2 , ...
.Sm on
.Op Fl t Ar tag
.Sh DESCRIPTION
The
.Nm
utility is a routing daemon which supports RIP over IPv6.
.Pp
The options are as follows:
.Bl -tag -width indent
.It Xo Fl A
.Sm off
.Ar prefix No / Ar preflen ,
.Ar if1
.Op , Ar if2 , ...
.Sm on
.Xc
This option is used for aggregating routes.
.Ar prefix Ns / Ns Ar preflen
specifies the prefix and the prefix length of the
aggregated route.
When advertising routes,
.Nm
filters specific routes covered by the aggregate
and advertises the aggregated route
.Ar prefix Ns / Ns Ar preflen
to the interfaces specified in the comma-separated interface list
.Sm off
.Ar if1 Op , Ar if2 , ... .
.Sm on
.Nm
creates a static route to
.Ar prefix Ns / Ns Ar preflen ,
with the
.Dv RTF_REJECT
flag set, into the kernel routing table.
.It Fl a
Enables aging of the statically defined routes.
With this option, any
statically defined routes will be removed unless corresponding updates
arrive as if the routes are received at the startup of
.Nm .
.It Fl D
Enables extensive output of debugging messages.
This option also instructs
.Nm
to run in foreground mode
.Pq i.e. it does not become a daemon process .
.It Fl d
Enables output of debugging messages.
This option also instructs
.Nm
to run in foreground mode
.Pq i.e. it does not become a daemon process .
.It Fl h
Disables split horizon processing.
.It Xo Fl L
.Sm off
.Ar prefix No / Ar preflen ,
.Ar if1
.Op , Ar if2 , ...
.Sm on
.Xc
Filter incoming routes from interfaces
.Sm off
.Ar if1 Op , Ar if2 , ... .
.Sm on
.Nm
will accept incoming routes that are in
.Ar prefix Ns / Ns Ar preflen .
If multiple
.Fl L
options are specified, all routes that match any of the options are accepted.
.Li ::/0
is treated specially as the default route, not
.Do
any route that has longer prefix length than, or equal to, 0
.Dc .
For example, with
.Dq -L 2001:db8::/32,if1 -L ::/0,if1 ,
.Nm
will accept the default route and routes in the 2001:db8::/32 address range,
but no others.
To accept any route, simply do not specify the
.Fl L
option.
.It Fl l
By default,
.Nm
will not exchange site local routes for safety reasons.
This is because the semantics of site local address space are rather vague,
as the specification is still being worked on,
and there is no good way to define the site local boundary.
With
.Fl l ,
.Nm
will exchange site local routes as well.
It must not be used on site boundary routers,
since
.Fl l
assumes that all interfaces are in the same site.
.It Xo
.Fl N
.Sm off
.Ar if1
.Op , Ar if2 , ...
.Sm on
.Xc
Do not listen to, or advertise, route from/to interfaces specified by
.Sm off
.Ar if1 Op , Ar if2 , ... .
.Sm on
.It Fl n
Do not update the kernel routing table.
.It Xo Fl O
.Sm off
.Ar prefix No / Ar preflen ,
.Ar if1
.Op , Ar if2 , ...
.Sm on
.Xc
Restrict route advertisement toward interfaces specified by
.Sm off
.Ar if1 Op , Ar if2 , ... .
.Sm on
With this option
.Nm
will only advertise routes that match
.Ar prefix Ns / Ns Ar preflen .
.It Fl q
Makes
.Nm
use listen-only mode.
No advertisement is sent.
.It Fl S
This option is the same as
.Fl s ,
except that the split horizon rule does apply.
.It Fl s
Makes
.Nm
advertise the statically defined routes which exist in the kernel routing
table when
.Nm
is invoked.
Announcements obey the regular split horizon rule.
.It Xo
.Fl T
.Sm off
.Ar if1
.Op , Ar if2 , ...
.Sm on
.Xc
Advertise only the default route toward
.Sm off
.Ar if1 Op , Ar if2 , ... .
.Sm on
.It Fl t Ar tag
Attach the route tag
.Ar tag
to originated route entries.
.Ar tag
can be decimal, octal prefixed by
.Li 0 ,
or hexadecimal prefixed by
.Li 0x .
.It Fl u
Always log route updates (insertions and deletions).
Route updates are always prefixed with
.Dq RTADD
or
.Dq RTDEL .
.El
.Pp
Upon receipt of signal
.Dv SIGINT
or
.Dv SIGUSR1 ,
.Nm
will log a dump of the current internal state.
.Sh SEE ALSO
.Xr ripd 8
.Sh STANDARDS
.Rs
.%A G. Malkin
.%A R. Minnear
.%D January 1997
.%R RFC 2080
.%T RIPng for IPv6
.Re
.Sh NOTES
.Nm
uses the advanced IPv6 API,
defined in RFC 3542,
for communicating with peers using link-local addresses.
.Pp
Routing table manipulation differs from IPv6 implementation to implementation.
Currently
.Nm
obeys the WIDE Hydrangea/KAME IPv6 kernel,
and will not be able to run on other platforms.
.Pp
Currently,
.Nm
does not reduce the rate of the triggered updates when consecutive updates
arrive.