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Forum Discussion
NAT Hairpinning/Loopback Not Working
I have noticed that NAT hair pinning only seems to work with *manual* port mapping, not UPnP / NAT-PMP.
A fascinating thought. Want to experiment with this. However.........
I know how to test NAT Loopback (hairpinning) by deliberately forwarding ports through the Orbi firewall. That works.
My guess is that UPnP Loopback can be tested by:
- Enabling UPnP in the Orbi Advanced Menu
- Installing some device/software that opens ports using UPnP
(the ports forwarded would show up in the UPnP table)
Can you suggest how a person can test UPnP Loopback?
Your guesses are correct.
Any UPnP (or NAT-PMP) application would suffice to reproduce the issue. I used Port Map for macOS https://www.codingmonkeys.de/portmap/ but really any would have the same effect, since the option to hairpin is not part of the UPnP or NAT-PMP protocols.