[core] #356: Which IPv6 multicast scopes for the "All CoAP Nodes" address?
"core issue tracker" <trac+core@trac.tools.ietf.org> Wed, 27 November 2013 13:19 UTC
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Subject: [core] #356: Which IPv6 multicast scopes for the "All CoAP Nodes" address?
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#356: Which IPv6 multicast scopes for the "All CoAP Nodes" address?
in coap-18 it mentions for the IPv6 “All CoAP Nodes” address:
Note that there is a distinct multicast address
for each scope that interested CoAP nodes should listen to; CoAP
needs the Link-Local and Site-Local scopes only.
which could raise some interoperability concerns:
- CoAP nodes are not obliged to join any of these addresses; so
multicast discovery may not work in practice.
A client may be tempted to instead use the “All Nodes” link-local IPv6
multicast address to send out a CoAP request, since IPv6 / 6LoWPAN-ND
requires joining this address.
- CoAP nodes only join the link-local and/or site-local scoped
address, not others (admin-local, or the new “realm-local” defined in
draft-droms-6man-multicast-scopes-02)
So a discovering client using e.g. admin-local may not find any CoAP
nodes.
My goal was to write some guidelines in groupcomm what IPv6 / IPv4
multicast addresses a CoAP server should join, and which addresses a
discovering client should use.
For now I will base on the information that core-coap provides; adding
that a server SHOULD join both the link-local and site-local “All CoAP
nodes” IPv6 multicast addresses.
--
-------------------------+-------------------------------------------------
Reporter: | Owner: draft-ietf-core-
esko.dijk@philips.com | groupcomm@tools.ietf.org
Type: protocol | Status: new
defect | Milestone:
Priority: major | Version:
Component: groupcomm | Keywords:
Severity: - |
-------------------------+-------------------------------------------------
Ticket URL: <http://trac.tools.ietf.org/wg/core/trac/ticket/356>
core <http://tools.ietf.org/core/>
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