[AT&T Fiber] TP-Link AX11000 Router Double NAT Situation [Solved - IP Passthrough on Main Router, Bridge Mode on Modem]]

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Hi @Brandon,

Thanks for reaching out and for your patience. Since you have the modem and third party router bridged properly (I assume they are hardwired together with an ethernet connection?), the issue may be at the carrier level (CG-NAT scenario).

A couple things to try:

  • Have you tried toggling/disabling UPnP in the TP-Link web admin?

  • Have you disabled the Windows firewall on your Core?

  1. Open Control Panel. …
  2. Select System and Security. …
  3. Choose Windows Firewall. …
  4. Select Turn Windows Firewall on or off on the left side of the screen. …
  5. Select the bubble next to Turn off Windows Firewall (not recommended). …
  6. Select OK to save the changes.