Recently, in the company to build sets of VMware vSphere6.7, two hosts are PowerEdge R630, system VMware ESXi 6.7; Storage group of NAS, and use ISCSI connection, set up to create a virtual machine test is normal, but the virtual machine when receiving multicast network throughput is not high, 100% network utilization, abnormal packet loss serious (top allied switches support and open multicast, separate physical machine can be normal to receive multicast), under the guidance of bosses,