Location-dependant IGMP

Could someone please enlighten me?
I spent a third of my work today wondering why

  • a modified QUdpSocket only leads to IGMPv1 membership reports
  • a self-written plain old socket multicast client only leads to IGMPv2 joins, but very seldom leaves

Now being at home, I tried both programs and both reliably send IGMPv3 joins and leaves…

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