Solved Port Forwarding not working

[glsmith86]

Hy Everybody!

I have an ASUS RT-AX56U router with Merlin firmware (ver: 386.7_2). Port forward isn't working. Firewall drop all incoming packets.

iptables --list command doesn't contain VSERVER chain. Forward only works after example "iptables -I INPUT -p tcp --destination-port 81 -j ACCEPT".

Please help!

 

[ColinTaylor]

Show us a screenshot of your port forwarding rules.

 

[eibgrad]

Are you perhaps running the router's OpenVPN client at the same time? Any devices bound to the VPN will NOT be reachable over the WAN if that's the case.

P.S. "iptables -I INPUT -p tcp --destination-port 81 -j ACCEPT" is NOT a port forward. That's just simply opening a port on the router. A port forward "forwards" from the router to some WLAN/LAN device, and would show up as a DNAT rule in the NAT table.

 

[glsmith86]

There is a screenshot from forwards.

 

[glsmith86]

Are you perhaps running the router's OpenVPN client at the same time? Any devices bound to the VPN will NOT be reachable over the WAN if that's the case.

P.S. "iptables -I INPUT -p tcp --destination-port 81 -j ACCEPT" is NOT a port forward. That's just simply opening a port on the router. A port forward "forwards" from the router to some WLAN/LAN device, and would show up as a DNAT rule in the NAT table.

No run OpenVPN.

 

[ColinTaylor]

What port or ports are you having problems with?

Is it only port 81? If it is you'll have to provide more details as to what service is running on this port.

 

[eibgrad]

You can NOT port forward to the router (192.168.1.1)! You can only port forward to rest of the WLAN/LAN devices. I've discussed this before in another thread.

Solved - UPNP/port forwarding not working on ax56u plex

I’ve been trying to figure this out and it’s driving me crazy I’ve recently installed plex on this router and it’s runs great locally - the only issue I’ve been having is I can’t get it exposed outside my network directly I’ve got a static IPV4 from my ISP but when I try to port forward 32400...

www.snbforums.com

That's why your example of manually adding an INPUT rule works. It's NOT a port forward.

Note too, I've suggested that the router *could* be enhanced by the developer (@RMerlin) to make it possible to use the port forwarding feature of the GUI in this fashion, as other routers sometimes do (e.g., DD-WRT). But so far that hasn't happened.

 

[glsmith86]

What port or ports are you having problems with?

Is it only port 81? If it is you'll have to provide more details as to what service is running on this port.

I have problems with all ports what is ended on the router.

 

[glsmith86]

You can NOT port forward to the router (192.168.1.1)! You can only port forward to rest of the WLAN/LAN devices. I've discussed this before in another thread.

Solved - UPNP/port forwarding not working on ax56u plex

I’ve been trying to figure this out and it’s driving me crazy I’ve recently installed plex on this router and it’s runs great locally - the only issue I’ve been having is I can’t get it exposed outside my network directly I’ve got a static IPV4 from my ISP but when I try to port forward 32400...

www.snbforums.com

That's why your example of manually adding an INPUT rule works. It's NOT a port forward.

Note too, I've suggested that the router *could* be enhanced by the developer (@RMerlin) to make it possible to use the port forwarding feature of the GUI in this fashion, as other routers sometimes do (e.g., DD-WRT). But so far that hasn't happened.

Thanks for the detailed answer. Before my asus system I use 2 TP-Link Archer C7 with OpenWRT. There I can forward ports to the router ports. I don't need to set up rules for it.

 

[eibgrad]

Before my asus system I use 2 TP-Link Archer C7 with OpenWRT. There I can forward ports to the router ports. I don't need to set up rules for it.

As I said, some firmware has been enhanced to support it, including DD-WRT. Others like Merlin and FreshTomato have NOT. I've even made an explicit request to do so w/ FreshTomato, which AFAICT, has NOT been implemented.

Enhancement Request: Support router itself as target of port forwarding

This recently came up as a topic on the Merlin forum. The following link should be sufficient to understand the issue, and how to correct it. So I'll only summarize things here rather than rehash it all. https://www.snbforums.com/threads/upnp-port-forwarding-not-working-on-ax56u-plex.79615/...

www.linksysinfo.org

So you just have to be lucky w/ your current firmware.