(usagi-users 03466) Re: IPv6 Multicast question - connect fails

On Mon, 2005-08-08 at 15:58 +0200, Bas Vermeulen wrote:
> Hi,
> 
> I've got some code that does the following:
> 
> Takes an IPv6 multicast address, and opens an UDP socket with
> socket(). It then sets the SO_REUSABLE sockopt, and binds the socket to
> in6addr_any and port 5060. I then connect() to the IPv6 multicast
> address (FF35::d:d44).
> 
> This works when the default interface has a global IPv6 address, but
> fails with a site-local (FEC0::1) or link-local (FE80::1) address.
> 
> Does anyone know why, and where I can find more information on this
> behaviour? I've included my test program. Any comments are welcome.

You definitely should be using getaddrinfo() See google(eva ipv6) =
gsyc.escet.urjc.es/~eva/IPv6-web/ipv6.html for the details.

site-locals should work, then again they are deprecated and thus you
shouuld not be using them.

Link-locals not working usually means that you bound to the wrong
interface.

Peeking at the code reveals that you think that the interface index
matches the scope id. Which is a very wrong assumption.
Check Eva's site for the solution to this and a lot of related info's.

Greets,
 Jeroen

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