I have a follow up question to authors of RFC 2461 or 2461bis I-D. In
section 3.1 para mentioned below where the RFC and I-D bis say "By
default, hosts learn..."
Since default is mentioned, can you clarify what other means exists for
a host to learn about on-link prefixes ? Are you referring to manual
configuration as another means ? What other ways besides manual config
exist to learn on-link prefixes ?
If it's only manual configuration, does it makes sense to add such a
reference? "By default" is a very loaded term that makes a reader
wonder, gee, how many other ways can one learn about on-link prefixes.
Thanks.
Hemant
-----Original Message-----
From: Wes Beebee (wbeebee)
Sent: Friday, June 29, 2007 9:38 AM
To: ipv6@ietf.org
Subject: Sending traffic to default router when RA has no PIO
Section 3.1 of RFC 2461 describes intended behavior when a host receives
an RA without an advertised prefix:
"Multiple prefixes can be associated with the same link. By
default, hosts learn all on-link prefixes from Router
Advertisements. However, routers may be configured to omit some
or all prefixes from Router Advertisements. In such cases hosts
assume that destinations are off-link and send traffic to routers.
A router can then issue redirects as appropriate."
As described in our draft, this language should be strengthened to state
that without advertised prefixes, without manual configuration, and
without redirects, hosts MUST send all non-link-local traffic to the
default router and MUST NOT issue an NS to resolve any destination other
than a link-local address.
Please note that a new, popular host implementation does not follow this
and failure to do so can result in lack of interoperability and
connectivity.
- Wes Beebee
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