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In the VMware vDefend Distributed Firewall (DFW), the "Applied To" field is a critical optimization feature. By default, DFW rules are applied to all workloads (Applied To: DFW). However, when you specify specific groups in the "Applied To" field, the rule is only pushed down to the specific vNICs of the virtual machines residing in those groups. This drastically reduces the size of the rule table maintained in memory on the ESXi host for each specific vNIC (the per VM vNIC rule count), improving hypervisor performance and ensuring that workloads only process rules relevant to their network traffic.

VMware vDefend Distributed IDS/IPS performs deep packet inspection right at the virtual machine's network interface card (vNIC). To intercept this traffic at the hypervisor kernel level, it requires the advanced networking hooks and abstraction provided by modern virtual switches.

It fully supports workloads connected to modern NSX Overlay Segments , NSX VLAN Segments , and traditional vSphere Distributed Switches (vDS) . However, legacy vSphere Standard Switches (vSS) lack the centralized management plane, distributed architecture, and necessary kernel APIs required to enforce NSX-based distributed security features. Therefore, you cannot implement Distributed IDS on a standard switch portgroup.