Hello, I'm hosting a webserver at home. The site is perfectly accessible from outside the network. When I try to access it from inside the network, it works via wifi but won't work on an ethernet connection. I tried this on multiple devices. Somehow NAT loopback is broken on ethernet only. Is there some setting somewhere for fixing this ?Thanks !

This link is to an idea forum where new things are being proposed. Being unable to establish a connection to a port on the public Internet is a bug. Please read RFC 5382 7.2. Hairpinning BehaviorNATs that forward packets originating from an internal address,destined for an external address that matches the active mapping foran internal address, back to that internal address are defined in[BEHAVE-UDP] as supporting "hairpinning". If the NAT presents thehairpinned packet with an external source IP address and port (i.e.,the mapped source address and port of the originating internalendpoint), then it is defined to have "External source IP address andport" for hairpinning. Hairpinning is necessary to allow twointernal endpoints (known to each other only by their external mappedaddresses) to communicate with each other. "External source IPaddress and port" behavior for hairpinning avoids confusingimplementations that expect the external source IP address and port. REQ-8: A NAT MUST support "hairpinning" for TCP.a) A NAT's hairpinning behavior MUST be of type "External sourceIP address and port".Justification: This requirement allows two applications behind thesame NAT that are trying to communicate with each other usingtheir external addresses.a) Using the external source address and port for the hairpinnedpacket is necessary for applications that do not expect toreceive a packet from a different address than the externaladdress they are trying to communicate with.

Currently Orbi AX is not yet included in the list of NETGEAR products that support NAT loopback:https://kb.netgear.com/000049578/NETGEAR-Router-support-for-NAT-Loopback

Thank you for the link. It's interesting that it works via Wifi though. Does anyone know if/when this feature will be completely implemented ? Thanks

I can confirm the lack of proper support for NAT loopback with a newly bought RBR750 (AX4200). Very disappointing. Netgear maintains a website with the subset of products that work correctly:https://kb.netgear.com/000049578/NETGEAR-Router-support-for-NAT-Loopback

Something to post about here:https://community.netgear.com/t5/Idea-Exchange-For-Home/idb-p/idea-exchange-for-home

RBR850 NAT loopback | NETGEAR Communities

12 Replies

kildare
Luminary
Apr 24, 2020
Currently Orbi AX is not yet included in the list of NETGEAR products that support NAT loopback:
https://kb.netgear.com/000049578/NETGEAR-Router-support-for-NAT-Loopback
- Kelsett
  Tutor
  Apr 24, 2020
  Thank you for the link. It's interesting that it works via Wifi though.
  
  Does anyone know if/when this feature will be completely implemented ?
  
  Thanks
  - gb777
    Apprentice
    Jun 19, 2020
    I can confirm the lack of proper support for NAT loopback with a newly bought RBR750 (AX4200).
    
    Very disappointing.
    
    Netgear maintains a website with the subset of products that work correctly:
    https://kb.netgear.com/000049578/NETGEAR-Router-support-for-NAT-Loopback
- jasueh
  Aspirant
  Nov 02, 2020
  kildare wrote:
  Currently Orbi AX is not yet included in the list of NETGEAR products that support NAT loopback:
  https://kb.netgear.com/000049578/NETGEAR-Router-support-for-NAT-Loopback
  I just checked the KB and it seems that RBR850 was added to the list.
  That doesn't mean that it works, I'm able to access a resource using an external connection but not using the public IP from within the LAN.
  - whoDean
    Guide
    Nov 08, 2020
    Same, NAT loopback isn't working for me on the RBR850. Basically devices connected via Ethernet cannot talk to devices connected to Wifi (same Router).

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RBR850 NAT loopback