Single or Dual port Nic?

  • I am planning to setup a virtual pfsense where it will only act as the firewall and not a router since I going place a router(ER-X) behind it. Since I am not planning to expand the connection from server, and I am using firewall only for my server do indeed to use dual port Nic or single port Nic will do the job ? If single port how do I configure it, since wan would be default.
    P.S.: i am using proxmox as my base os and admin port for it is different from what is mentioned above.

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