Some wireless devices are unreachable from clients but are reachable from the router itself

[itayt]

Hi all, I'm recently having a weird issue with my ax88u and I don't even know where to begin diagnosing it.

Most of my IOT devices like Shelly and Reolink cameras are usually unreachable by devices in my network.
They sometimes are reachable, especially after a router restart but most of the time they're not. Ping doesn't work from clients in the network however if I ping the unreachable devices from the Asus UI I always get a ping back so the devices are in fact online and operating, this is also confirmed by the fact that I can reach them remotely if I don't block their wan access
Any idea what I should be checking to solve this?

 

[bennor]

It may help if you include the firmware running on the router.
Are the problematic devices on the Guest Network?
Are you using VPN?
Have you assigned manual IP addresses for the problematic WiFi devices?
Does rebooting help?
What other troubleshooting steps have you tried?

If you haven't done so already, use the forum search feature and search the forum. There are a number of past discussions on "Shelly" devices having WiFi issues with Asus routers.

 

[itayt]

It may help if you include the firmware running on the router.
Are the problematic devices on the Guest Network?
Are you using VPN?
Have you assigned manual IP addresses for the problematic WiFi devices?
Does rebooting help?
What other troubleshooting steps have you tried?

If you haven't done so already, use the forum search feature and search the forum. There are a number of past discussions on "Shelly" devices having WiFi issues with Asus routers.

I'm running Merlin 3004.388.8_4
The problematic devices are in the regular 2.4GHz network, they're not in the guest network.
I'm not using a VPN
All problematic devices have manually assigned IPs. None of my IOT devices have DHCP assigned addresses
Yes, rebooting helps but only for an hour or two
I've tried a factory reset and restoring from a backup, I've tried disabling parental control and making sure the iptables rules have no drop rules for said devices but other than that I'm not quite sure where to look.

I gave Shelly as an example but as stated it happens with all of my IOT devices, including Reolink cameras and some tuya wifi switches - they're all pingable and reachable from the router itself but not from any client within the network.

EDIT: Looks like a restart no longer helps the situation

 

[degrub]

Is the setting for Auto channel selection on for the 2.4GHz bands ?
If so, try manually setting it , re-boot, and see if the behavior changes.

 

[OzarkEdge]

All problematic devices have manually assigned IPs. None of my IOT devices have DHCP assigned addresses

If the IPs are 'manually-assigned' by the router, then they are being assigned by the router DHCP server and should be included in the router DHCP server IP Pool setting. Otherwise, static IPs assigned manually on each client by you should be excluded from the router IP Pool setting.

OE

 

[bennor]

The problematic devices are in the regular 2.4GHz network, they're not in the guest network.

Some who have WiFI 2.4Ghz band issues have indicated that setting the Wireless > General (2.4Ghz) > Wireless Mode to Legacy seems to work to solve some WiFi issues.

 

[datitzer]

Hi all, I'm recently having a weird issue with my ax88u and I don't even know where to begin diagnosing it.

Most of my IOT devices like Shelly and Reolink cameras are usually unreachable by devices in my network.
They sometimes are reachable, especially after a router restart but most of the time they're not. Ping doesn't work from clients in the network however if I ping the unreachable devices from the Asus UI I always get a ping back so the devices are in fact online and operating, this is also confirmed by the fact that I can reach them remotely if I don't block their wan access
Any idea what I should be checking to solve this?

This sounds like "isolation" mode where Wi-Fi devices are not permitted to communicate with each other on the network, only out to the internet. Not a bad thing to enable if you have IoT devices behind portal-based services. Disable that, then test.

 

[itayt]

Thanks for the replies everyone
Seems like @degrub 's suggestion did the trick. It's been 2 days without any disconnections.
Hopefully it really was this and not a coincidence, but I can't believe it was that simple!

 

[degrub]

Many IOTs assume a constant channel and have a hard time switching without a reboot.