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      Latest reply on Oct 13, 2019 4:45 AM by eskimo
      ide-x Level 1 Level 1 (0 points)

        I am posting this article to ask question about history of multicast communication in iPhone.

        In multicasst communication, there is a comumunication protrocal called "IGMP". The protocol is divided into several different types such as "V2" and "V3".

        Recently, I encountered the problem which will not allow to obtain the information of communication function of app and it occured due to the by the difference in the types of communication protocol, .

        I am wondering if there is anyone who can answer or assist me with the following questions regarding communication history;

        a)When did iPhone start to correspond with multicast communication?

        b)Details of history of the model corresponded with the communication protocol, "V2" and "V3". (eg. when it started to correspond.)

        c)What was the trigger of enhancement and update for IGM communication function?

        Any assistance and information regarding this matter will be greatly appreciated.

        Thank you.

        • Re: Question regarding History of iPhone's  multicast communication
          eskimo Apple Staff Apple Staff (11,955 points)

          IGMP v3 is decades old (the standard, RFC 3376 dates from 2002) and, as such, has always been supported by iOS.

          Recently, I encountered the problem which will not allow to obtain the information of communication function of app and it occured due to the by the difference in the types of communication protocol

          That’s quite a leap.  Can you explain more about how you came to focus on the IGMP version?  In my experience, most programs that use multicast don’t use IGMP at all because they focus on link-local multicast.

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