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Index: share/man/man4/stf.4
===================================================================
--- share/man/man4/stf.4
+++ share/man/man4/stf.4
@@ -29,7 +29,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd December 28, 2012
+.Dd November 16, 2021
.Dt STF 4
.Os
.Sh NAME
@@ -44,11 +44,15 @@
.Nm
interface supports
.Dq 6to4
+and
+.Dq 6rd
IPv6 in IPv4 encapsulation.
It can tunnel IPv6 traffic over IPv4, as specified in
-.Li RFC3056 .
+.Li RFC3056
+or
+.Li RFC5969 .
.Pp
-For ordinary nodes in 6to4 site, you do not need
+For ordinary nodes in a 6to4 or 6RD site, you do not need
.Nm
interface.
The
@@ -56,6 +60,8 @@
interface is necessary for site border router
(called
.Dq 6to4 router
+or
+.Dq 6rd Customer Edge (CE)
in the specification).
.Pp
Each
@@ -69,6 +75,7 @@
.Va cloned_interfaces
variable in
.Xr rc.conf 5 .
+.Sh 6to4
.Pp
Due to the way 6to4 protocol is specified,
.Nm
@@ -180,6 +187,41 @@
If you wish to use the configuration,
you must not advertise your 6to4 address to others.
.\"
+.Sh 6rd
+Like
+.Dq 6to4
+.Dq 6rd
+also requires configuration before it can be used.
+The required configuration parameters are:
+.Bl -bullet
+.It
+The IPv6 address and prefix length.
+.It
+The border router IPv4 address.
+.It
+The IPv4 WAN address.
+.It
+The prefix length of the IPv4 WAN address.
+.El
+.Pp
+These can parameters are all configured through
+.Xr ifconfig 8 .
+.Pp
+The IPv6 address and prefix length can be configured like any other IPv6 address.
+Note that the prefix length is the IPv6 prefix length excluding the embedded
+IPv4 address bits.
+The prefix length of the delegated network is the sum of the IPv6 prefix length
+and the IPv4 prefix length.
+.Pp
+The border router IPv4 address is configured with the
+.Xr ifconfig 8
+.Cm stfv4br
+command.
+.Pp
+The IPv4 WAN address and IPv4 prefix length are configured using the
+.Xr ifconfig 8
+.Cm stfv4net
+command.
.Sh SYSCTL VARIABLES
The following
.Xr sysctl 8
@@ -241,6 +283,24 @@
# route add -inet6 2002:: -prefixlen 16 ::1
# route change -inet6 2002:: -prefixlen 16 ::1 -ifp stf0
.Ed
+.Pp
+The following example configures a
+.Dq 6rd
+tunnel on a
+.Dq 6rd CE
+where the ISP's
+.Dq 6rd
+IPv6 prefix is 2001:db8::/32.
+The border router is 192.0.2.1.
+The
+.Dq 6rd CE
+has a WAN address of 192.0.2.2 and the full IPv4 address is embedded in the
+.Dq 6rd IPv6 address:
+.Bd -literal
+# ifconfig stf0 inet6 2001:db8:c000:0202:: prefixlen 32 up
+# ifconfig stf0 stfv4br 192.0.2.1
+# ifconfig stf0 stfv4net 192.0.2.2/32
+.Ed
.\"
.Sh SEE ALSO
.Xr gif 4 ,

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