Solved RT-BE92U LAN communication problem with original firmware

[redbird71]

Router: ASUS RT-BE92U
Firmware: 3.0.0.6.102_38980

So I just bought the above mentioned router and wanted to run some test with the original firmware before installing Merlin. My problem is that any device connected on Lan port 1 can speak to all other devices connected to the other Lan ports, but the devices connected to Lan ports 2-4 can not communicate with each other.

Dual-WAN is OFF and Primary WAN is set to 10G WAN/LAN-1 and I can’t think of any other setting that could possibly have anything to do with it.

My question is: anybody else experiencing this? Is it likely that updating to Merlin will solve this issue?

Thanks in advance.

 

[Dr.Cheeks]

I guess you have a 'guest network' enabled, with 'device isolation' turned on. (Or any other additional network, with that feature turned on.)

This would (should) normally prevent devices connected to the 'guest network' to 'directly talk to each other' (they can only access the Internet), but unfortunately has a side-effect that the 'fixed LAN ports' also get the same restriction applied.

Remove the 'guest network' (or the other 'network' where you've enabled the feature), and the LAN ports can talk to each other again.

PS: I can't remember if the term 'device isolation' is exactly what ASUS calls it in the GUI, but I hope you understand what I mean...

 

[Dr.Cheeks]

See also here:

BE 98 Pro 3006.102.5 Upgrade LAN Port Issue

When I upgraded to 3006.102.5 my router's 2.5G LAN ports quit communicating with one another. I have two 2.5G and two 10G ports active. Each 2.5G port could communicate with the 10G ports but could not talk to each other. One 2.5 port has 3 aimesh and 9 cameras on it and a NAS on the other...

www.snbforums.com

 

[redbird71]

I guess you have a 'guest network' enabled, with 'device isolation' turned on. (Or any other additional network, with that feature turned on.)

This would (should) normally prevent devices connected to the 'guest network' to 'directly talk to each other' (they can only access the Internet), but unfortunately has a side-effect that the 'fixed LAN ports' also get the same restriction applied.

Remove the 'guest network' (or the other 'network' where you've enabled the feature), and the LAN ports can talk to each other again.

PS: I can't remember if the term 'device isolation' is exactly what ASUS calls it in the GUI, but I hope you understand what I mean...

This worked! Thank you so much. I spend like a whole day finding the problem in the first place and the whole morning going through settings.
I understand this will also happen with Merlin firmware?

BTW it's under Network --> Guest Network --> Advanced Settings --> Set AP Isolated

 

[Tech9]

This would (should) normally prevent devices connected to the 'guest network' to 'directly talk to each other' (they can only access the Internet), but unfortunately has a side-effect that the 'fixed LAN ports' also get the same restriction applied.

This is a firmware bug then. Report it to ASUS in Feedback Form.

 

[Dr.Cheeks]

This worked! Thank you so much. I spend like a whole day finding the problem in the first place and the whole morning going through settings.
I understand this will also happen with Merlin firmware?

BTW it's under Network --> Guest Network --> Advanced Settings --> Set AP Isolated

Same here, when I encountered it, took me quite a while...

AFAIK it is a 'base ASUS issue'. Assuming you're on the most recent ASUS firmware, then yes: it will (very very likely) also be in Merlin. My understanding is that as long as the issue is present in stock ASUS firmware, the issue will also be in the Merlin...

(There is some other weirdness in the BE-92U LAN ports. I always had the Internet Provider modem connected to the 10G WAN port, but 'suddenly' that stopped working a while ago. I could only resolve it by connecting the modem to the 'first LAN port', which can function as 'alternative WAN port'. So that 'cost' me a LAN port...)

 

[Tech9]

but 'suddenly' that stopped working a while ago

If nothing works on this port - perhaps damaged port, hardware issue. Usually caused by lightning strike, but may stop working by it's own as well. You may try to get RMA from ASUS Support.