Hi,
I use GL-MT300A and firmware 2.265.
How do I disable DHCP for LAN so that DNS continues to work?
DHCP relay disrupts the network because there is already another DHCP on the network.
I tried to unlink the DHCP from the LAN interface, but it didn’t help.
Unfortunately, I didn’t wait for advice 
So I stupidly deleted the packages odhcp6c and odhcpd
I don’t know how well I did it, but it works.
This should be a safer method if you have to do it again in the future:
Log into the LuCI UI and go to Network → Interfaces → LAN → Edit. On the DHCP Server tab, Check/Enable Ignore interface to turn off the DHCP server. Save and Apply the settings, then reboot the router.
I do not work for and I am not directly associated with GL.iNet
Thank you, that’s exactly what I did:
I tried to unlink the DHCP from the LAN interface, but it didn’t help
After that I deleted the packages and it worked.
That is strange. It has worked for me on other GL.iNet routers.
Another option is to go to Network → System → Startup and Stop+Disable the DHCP server from starting up.
Network → System → Startup and Stop+Disable the DHCP server
Thank you.
Unfortunately, there was no such useful option in my menu, otherwise I would have used it right away.
Sorry, I was going by memory because I am not at home to check on my router.
The option is actually LuCI → System → Startup, but the service may no longer be there after you deleted packages.
I also reproduce it from memory 
: this opportunity did not exist BEFORE the packages were removed.