>>>>> On Sat, 3 Jun 2000 10:24:28 +0300 (EET DST),
>>>>> Martti Mela <[EMAIL PROTECTED]> said:
> How to call all-hosts group multicast address with getaddrinfo() so that
> both IP and v6 addresses are returned? Is there even all-hosts group in
> v6? The idea is to join the group without knowing the address family in
> use.
IPv6 has a notion of all-hosts group addresses:
All Nodes Addresses: FF01:0:0:0:0:0:0:1
FF02:0:0:0:0:0:0:1
The above multicast addresses identify the group of all IPv6 nodes,
within scope 1 (node-local) or 2 (link-local).
(RFC 2373, Section 2.7.1)
However, I suspect that it is not so easy to join such groups
af-independently (using getaddrinfo). There would be at least two
problems:
- (as far as I know) there is no hostname corresponding to IPv6 all
nodes group addresses (like all-systems.mcast.net in IPv4).
- socket options to join a multicast group (IPV6_JOIN_GROUP for IPv6,
IP_ADD_MEMBERSHIP for IPv4) are not AF-independent, like other
system calls such as bind, connect, sendto, etc...
I hear that the IETF mboned wg is now considering a new API for
multicasting that will be AF-independent, but the API has not been
standardized (and there is no -or very few if any- implementations
of the API).
JINMEI, Tatuya
Communication Platform Lab.
Corporate R&D Center, Toshiba Corp.
[EMAIL PROTECTED]
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