I think the problem lies with my network. When I checked the network settings in the default gateway address, all IGMP related options had already been turned on. I tried your solution, but nothing changed. I also tried using another real machine to test, but the problem still persisted.

In reply to Re^2: How to properly send and receive data from multicast? by Anonymous Monk
in thread How to properly send and receive data from multicast? by Anonymous Monk

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