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Hi, yes, NDP is enabled on all levels (Datacenter, Host and VM). It makes no difference disabling it at any place, I checked every combination. Even disabled firewall on Host (it is already disabled on Datacenter level) makes no difference. Only removing "firewall=1" from tne vNIC helps...

Hello community, we observe a strange problem here (Cluster on PVE 7.2-3 with open vSwitch): The ICMPv6 NS (Neighbor Solicitation) packet does not seem to arrive inside the VM (it is a Cisco C9800-CL Wireless Controller) when the vNIC has "firewall=1" set. As soon as we remove the "firewall=1"...