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I'm building a pair of Dell R620 ESXi 6.7 hosts for my home lab and plan to run redundant Opnsense VMs.  I need to size the VMs to support Gig throughput with IDS, AV, Netflow, etc for a handful of internal and DMZ networks with 5-10 active users and roughly 100 IP devices. 

I'm thinking 4 cores, 8 GB RAM, and 250 GB SSD should be plenty.  Does that seem right?