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We have the RUTX11 for a month now, a few days ago we started experiencing following issues:
(We have 18 clients on wifi, all with static IPs based on their MAC addresses)

1.
Two of them suddenly disappeared from the DHCP list and became unreachable, even though they still have internet connectivity.
The wifi section shows that they are connected, only they don't have hostnames.
After a reboot the issue disappeared.

2.
Ping times between clients started randomly varying from 22ms to 700ms and frequent timeouts.

A note:
We're setting the static IPs via SSH, by replacing the dhcp file and then resetting the connection in order for the changes to apply, using following script (but we're using it from the start so I doubt that's the reason):
 

/etc/init.d/dnsmasq restart
uci set wireless.@wifi-iface[0].user_enable=0 && uci set wireless.@wifi-iface[0].disabled=1 && uci commit && wifi
sleep 6
uci set wireless.@wifi-iface[0].user_enable=1 && uci delete wireless.@wifi-iface[0].disabled && uci commit && wifi


We have the latest firmware installed. I've attached the troubleshooting file.
Thanks

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Hello, 

It is possible that the configuration is not working correctly, because of the static IP's assignment by the DCHP file.  If you have the firmware updated to its latest version (RUTX_R_00.07.01.4), the proper way to add these users is through the Static Lease. To do this, you can log in via WebUI Network→Interfaces→LAN. And add the devices in the static lease section. There you can assign the IP you want to the device with the MAC respectively.