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Forum Discussion
RBR760 Port Forwarding Port 4500
I’ve been struggling with this issue for weeks, and have made no progress, so hopefully someone can help.
My network setup is a BT ONT feeding FTTP, with an Orbi RBR760 connected to the ONT as a router. I’ve disabled DCHP on the Orbi so this can be managed by a Synology NAS.
I’m pretty sure I’m not in a double NAT situation.
I have an L2TP VPN set up on the Synology NAS, and am trying to port forward from my Orbi to the Synology NAS to enable the VPN to be connected to.
I’ve successfully been able to port forward ports 500 and 1701, but when I try to port forward port 4500, it tells me the specified port is being used by the system.
I have been able to find out from Netgear Support that the Orbi uses port 4500 for NAT Traversal Traffic, but they’ve not been able to assist any further, and I’ve not been able to find out how I can change this for searching on the internet.
My last resort seems to be to set up a separate router to do this, and set the Orbi to AP mode so it only provides the Mesh network, but it feels like there should be a better way to resolve this than that.
Anyone got any advice?
28 Replies
That message (thanks for posting the image) appears to indicate that after the router reboots, port 4500 will be forwarded to the Synology. Does that not happen? Forwarding ports does not normally require a reboot.
My searches turn up vague references to computers "behind a NAT" not working with L2P2 and concerns about L2P2 (such as Android not allowing it).
Q: Is L2P2 an absolute necessity? There are other VPNs which work quite well through Orbi routers (OpenVPN, Wireguard)
Q: OpenVPN allows the user to specify ports, which are then put into the configuration file. Does L2P2 have a similar capability?
Q: One suggestion I found was to put the L2P2 server (host?) in the router DMZ. This would expose every port on the Synology to the internet
- Unfortunately after reboot it still doesn’t work, and I’ve tried adding the NAS to the DMZ, and that doesn’t work either.
L2TP is the VPN service which my Synology NAS offers which works for my needs (or at least would if I could get it working).
It’s what I’ve always used up until I got my Orbi.
Unfortunately there’s no way to change the ports being used, either on the Synology or the iOS clients I’m using.Oh, geez. Does L2TP offer needed features that other VPNs do not? (That seems to be the crux of the matter. There are multiple ways to implement other VPNs, including using OpenVPN built into the router.)
Synology claims to support multiple VPN types:
https://www.synology.com/en-us/dsm/packages/VPNCenter
If the Synology is put in the DMZ, then ports should not be forwarded through the Orbi at the same time. (Either one or the other. Not both.)
If Netgear accepts support requests, are you still within the 90 day window of complimentary support? Perhaps you could return the 750 package and purchase a different mesh WiFi system.
