A fly ling core board board ubuntu18 above three card one extended out of the four RJ45 port factory is make the extension to bridge form my desktop via Ethernet cable connected with the four mouth can ping the address of the bridge sends a multicast unicast broadcasting, three types of udp multicast receiving less than 224.0.0.1-255 reserved address can receive normal network multicast address can't use wireshark to also can't see the package is the underlying problems setting up the system or hardware directly blocked before heard of switches are shielded multicast this restriction don't know how to get rid of

CodePudding user response:

The shield is external to receive foreign send multicast is not blocked