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document scoped address issues.

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itojun 1999-07-03 05:19:45 +00:00
parent bd99d900df
commit 70d8ef4285
1 changed files with 35 additions and 1 deletions
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36
share/man/man4/inet6.4
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@ -25,7 +25,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $Id: inet6.4,v 1.2 1999/07/01 10:50:48 itojun Exp $
.\" $Id: inet6.4,v 1.3 1999/07/03 05:19:45 itojun Exp $
.\"
.Dd January 29, 1999
.Dt INET6 4
@ -107,6 +107,40 @@ can be obtained by setting
.Dv sin6_addr
field into 0, or by using the address contained in variable
.Dv in6addr_any .
.Pp
IPv6 defines scoped address such as link-local or site-local address.
To manipulate link-local addresses properly from the userland,
programs must use advanced API defined in RFC2292.
Otherwise, the address is ambiguous to the kernel and error will be generated.
Scoped address is not for daily use at this moment both from specification
and implementation point of view.
Most of normal userland program
like
.Xr telnet 1
or
.Xr telnetd 8
cannot handle scoped address properly.
Only special programs,
like
.Xr ping6 8 ,
supports scoped address.
For example,
.Xr ping6 8
has special option for specifying outgoing interface
to disambiguate scoped addresses.
.Pp
Scoped addresses are handled specially in the kernel.
Scoped addresses will have its interface index embedded into the address,
in routing table or interface structure.
Therefore,
the address on some of the kernel structure is not the same as that on the wire.
The embedded index will be visible on
.Dv PF_ROUTE
socket and results from
.Xr ifconfig 8 ,
HOWEVER, users should never use the embedded form.
For details please consult
.Pa sys/netinet6/IMPLEMENTATION .
.Sh PROTOCOLS
The
.Nm