Single NIC install
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It will work just fine with the one LAN NIC for that purpose.
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Pfsense to be honest would not be a great choice for just a dns server.. Install some minimal OS and then run just clean Bind install would prob be a better option.. Is there are features of pfsense that you also want to leverage?
But yes pfsense can run with just a single interface.
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Assigning only WAN has been fine for 6-7 years now, all 2.x versions. Prior to that, LAN and WAN were a requirement (though some people ran single interface back then too just assigning a dummy VLAN as the unused LAN).
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No. (Why does it matter, though?)
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If you are going to use this as a DNS server appliance on LAN - wouldn't this be behind a firewall already? Can really just turn off the packet filter altogether.
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WAN. And you shouldn't end up locked out of the firewall. When you only assign WAN, then access is allowed on WAN until you create another interface. Though, as said, just can disable the packet filter altogether. The wizard is not really useful for this type of setup, just skip it.
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Well, seems like you are doing something basic very wrong. With pf off, there's really nothing to block packets.
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you seem to misunderstand something.
why do you want to hand out a different gateway IP address via DHCP?
