pfSense DMZ Home Network Lab
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 How would I build DMZ home network lab with external and internal firewall using pfSense. 
 Should I use two instances of pfSense or one instance can accomplish this.
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 No need for two routers for home use DMZ in my opinion. Use VLANS or different LAN interfaces on the router for your LAN & DMZ and two switches. If you use VLANS you'll need a switch that supports 802.1q. On the DMZ interface block traffic to the LAN interface addresses. 
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 what is the disadvantage of deploying two instances. I find it to be straight forward 
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 Just seems to be a bit of an overkill tbh. 
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 You could also do this with three NICs and two switches. NIC 1 -> WAN 
 NIC 2 -> LAN
 NIC 3 -> DMZSet up your FW rules so that connections can go into the DMZ, nothing can initiate a connection out of it. Then you're done. You'll have the physical segmentation you're looking for, and it's relatively inexpensive and fairly simple to do this. 
