RBR760 Port Forwarding Port 4500

Does your firmware include the "IoT Network" feature on the Wireless setup page?  (This came out in Sept, 2023 for the 750 and 850 products).

My hunch is that Netgear has not assigned anyone to implement new firmware on the 760, just as they have ignored the 350.

No matter.  Firmware on my RBR50 was last updated in Feb, 2023 and the port forwarding rule was accepted on it as well as the RBR750.  I should have caught this discrepancy the first day.

The 760 series system is based on 350 series model. NG hasn't come out with any newer FW for the 350 or 760 model set. The 350 series is not compatible with v7 FW. Also be aware that the 350 series is EoL so mostly likely won't get any more FW updates. You may want to get into different router system and convert the 760 series in to AP mode and use it for the wireless capabilities. 

The separate IoT network feature came in with v7 FW. 

FURRYe38 could you see if whichever Orbi router you have active now will Port Forward UDP 4500?

Things like NAT and Port Forwarding are buried so deep in Netgear firmware, I am struggling to imagine how those features would be different from one router to another.

Will check and see. Not at home right now. Will see if others can check too. 
I see your 750 doesn't have this problem. 

Possible this wasn't a design/bug issue in 750 series onwards. 

The 350 series was entry level hardware so not a lot of features would have been included I presume. Something got left out or caused this bug only on the 350 series that got past. 

This is from a 960 series loaded with v.21 FW:

Thank you donawalt 

No. 

As the first Orbi product to support WiFi6E (the 6Ghz frequency band), the 960 is clearly build around different WiFi radio chips.  The WiFi5 RBR50 and the WiFi6 RBR750 utilized the previous generation of Qualcomm chips

NAT and Port Forwarding have nothing to do with the WiFi side of the product.  The evidence appears to be building up that WiFi5, WiFi6, and WiFi6E Orbi routers support forwarding port 4500.  (Maybe someone with a WiFi7 Orbi can test forwarding port 4500 on it?)

What is different about the 760 is that rather than use 4x4 MIMO for the 5G backhaul WiFi link, Netgear "cheaped out" and used only 2x2 MIMO.  Saved a few bucks.

https://fccid.io/PY321100530/Internal-Photos/Internal-Photos-ver-2-5564899 

In terms of solutions to the issue of connecting devices on the internet to web servers on the LAN, purchasing another router and changing the RBR760 from router to access point (AP) mode would not be my first choice:

1. Use the OpenVPN Host built into the Orbi router (free)
2. Forward individual ports to each of the LAN web servers (free) for example:
   1. External port 1441 to port 443 on server 1
   2. External port 1442 to port 443 on server 2
   3. External port 1443 to port 443 on server 3
3. Implement OpenVPN Host on the Synology NAS (free)
4. Implement Wireguard Host on the Synology NAS (free)
   https://www.blackvoid.club/wireguard-vpn-for-your-synology-nas/ 
5. Spend $80 (plus tax) on one of those MT-2500 appliances, which also provides a VPN Client feature.

It is damned annoying that forwarding UDP port 4500 does not appear to work with the RBR760, but that solution appears to be blocked because:

• It would cost more to get a support contract with Netgear than to buy a solution, and
• Netgear support appears to repudiate that port 4500 can be forwarded, even though we have at least three Orbi systems that are able to forward port 4500.

Be sure wifi radios are disabled on the older router.

What is the brand and model# of the older router? 

Try setting up a static IP address configuration on the RBR for AP mode:

https://community.netgear.com/t5/Orbi-WIFI-6-AX-AND-Wi-Fi-6E-AXE/Procedure-for-Factory-reset-of-RBS850/m-p/2367505/highlight/true#M53985