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List:       ipng
Subject:    Re: Question on IPV4/IPV6 Multicast interoperability
From:       Simon Perreault <simon.perreault () viagenie ! ca>
Date:       2011-12-21 20:30:07
Message-ID: 4EF241CF.4050902 () viagenie ! ca
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On 2011-12-19 22:51, Ghanashyam Satpathy wrote:
> Thanks for the reply and understands the theory but unable to make it in my code.

Your code might not need any modification at all...

Normally, IPv4 multicast and IPv6 multicast are incompatible.
a) An IPv4-only listener can receive multicast from an IPv4 source.
b) An IPv6-only listener can receive multicast from an IPv6 source.
c) A dual-stack listener can receive multicast from both IPv4 and IPv6 sources.
d) But an IPvX-only listener cannot receive multicast from an IPvY-only source.

To be able to do d), you need something between the listener and the source, what 
these days gets called an "adaptation function". It typically does not require 
code changes on the source or listener.

There is currently an effort in the IETF called "multrans" trying to standardize 
methods and protocols to do that. Some vendors already have "running code" that 
can translate between IPv4 and IPv6 multicast.

Simon


> *From:* Tina TSOU <Tina.Tsou.Zouting@huawei.com>
> *To:* Ghanashyam Satpathy <ghanashyam_satpathy@yahoo.com>; "ipv6@ietf.org"
> <ipv6@ietf.org>
> *Cc:* "multrans@ietf.org" <multrans@ietf.org>; MBONED WG <mboned@ietf.org>
> *Sent:* Tuesday, December 20, 2011 6:09 AM
> *Subject:* RE: Question on IPV4/IPV6 Multicast interoperability
>
> Ghanashyam,
> http://datatracker.ietf.org/doc/draft-tsou-multrans-addr-acquisition/
> http://datatracker.ietf.org/doc/draft-zhou-multrans-af1-specification/
> Running code exists.
> Hope it helps.
> Best Regards,
> Tina TSOU
> http://tinatsou.weebly.com/contact.html
> *From:*ipv6-bounces@ietf.org [mailto:ipv6-bounces@ietf.org] *On Behalf Of
> *Ghanashyam Satpathy
> *Sent:* Sunday, December 18, 2011 3:14 AM
> *To:* ipv6@ietf.org
> *Subject:* Question on IPV4/IPV6 Multicast interoperability
> Hello,
> I have a question on IPV4/IPV6 Multicast interoperability. We have succesfully
> upgraded our application(Windows Based) to support IPV6 and faced issue on
> multicast interoperability. Multicast messages sent by a IPV6 server is
> successfully receved by a client running on IPV6. But any client running on IPV4
> is not able to receive the message.
> Quite a no. of things I tried like using IPV4 mapped IPV6 address and V4 embeded
> V6 adress.But nothing seems to be working.Would like to know an unified way so
> that one multicast message sent by an IPV6 server should be received by both V6
> and V4 client.
> Would be great if somebody can send some code snippet(C/C++) on it.
> Thanks.
> Ghanashyam
>
>
>
>
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