Pfsense Package License
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 I have a redundancy setup, and I have a license for my Primay Pfsense Plus, 
 so do i need to purchase another license for my secondary (Redundant) Pfsense Plus?
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 @anandpeculiar Yes. Each router will have a unique NDI based on things like network cards. 
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 Do both boxes need to be on either Plus or CE for HA setup to work even if hardware is identical? 
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 @MarinSNB Not sure, but I would guess you're likely to run into a problem if the Plus router is a newer FreeBSD version. The config sync could be a problem too because there are versions of the config file. https://docs.netgate.com/pfsense/en/latest/releases/versions.html 
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