[Qt-interest] Wish-List-ing (Was: What is likely to be in Qt 4.8?)

[Thiago Macieira]

Em sexta-feira, 25 de fevereiro de 2011, às 15:17:06, Abdelrazak Younes 
escreveu:
> On 02/24/2011 08:31 PM, Thiago Macieira wrote:
> > On Thursday, 24 de February de 2011 19:03:10 Dan White wrote:
> >> With all the speculation about the contents of the next release, I
> >> thought I would ask if anyone has given any consideration to
> >> Multicast support ?
> > 
> > You mean like the one that is in Qt 4.8?
> > 
> > http://qt.gitorious.org/qt/qt/blobs/master/src/network/socket/qudpsocket
> > .h#line80
> 
> That's very interesting and welcome!
> 
> Any chance to get support IGMP report as well? (in response to IGMP
> queries I mean)

The Operating System will do it for you. Multicast group membership is 
achieved by sending and replying to IGMP messages.

> I guess this works only with IPV4/IGMP, any chance for IPV6/MLD ?

Again, this is the OS's job. Whereas multicast on IPv4 (and hence IGMP) was 
optional, multicasting on IPv6 is mandatory. MLD is not a separate protocol, 
it's part of ICMPv6.

The /sbin/ipmaddr (or /sbin/ip maddr) command on Linux lists the multicast 
addresses (hence the name) that the OS is listening on. It should do IGMP 
conversations on any non-local addresses.

Trivia: we added multicast support because we've been designing a protocol for 
our distributed compile farm that has (had) an election mechanism similar to 
SMB, but using multicasting in a way similar to what IGMP does.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
      PGP/GPG: 0x6EF45358; fingerprint:
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