How do I get an Open NAT?

  1. Put your secondary router into modem mode / bridge mode; if this is not possible then:
  2. Put the Netduma R1 into a DMZ on your secondary router; if this is not possible then:
  3. Remove all port forwarding rules on your secondary router and enable UPnP. Your Netduma R1 will automatically open ports to give you an open NAT

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