Distributed Firewall - VMware
https://docs.vmware.com/en/VMware-NSX-Data-Center-for-vSphere/6.4/com.vmware.nsx.admin.doc/GUID-95600C1C-FE9A-4652-821B-5BCFE2FD8AFB.html
NSX Manager virtual appliance, NSX Controller VMs, and NSX Edge Service Gateways are automatically excluded from DFW. If a VM does not require DFW service, you can manually add it to the exclusion list. As DFW is distributed in the kernel of every ESXi host, firewall capacity scales horizontally when you add hosts to the clusters.
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