RT-AC86U 384.19 Unable to set DNS in WAN tab

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kavsak

New Around Here
Just set up a new AC86U with 384.19. All seems to running fine except when I try to set a DNS manually in the WAN tab I get "Please enter a value between 576 to 9000". Entering a number tells me that it is not IP address.
Does anyone have any ideas?
 

jcinwa

New Around Here
I had that problem the other day as well, it was the WAN MTU in my case - default seems to be 1500 but if you tinker with some dns settings it seems to get blanked out and then it asks for a value.
 

ColinTaylor

Part of the Furniture
@kavsak Sounds like @jcinwa has the solution, but after installing 384.19 did you factory reset the router and reformat the jffs as explained in the release notes?
 

kavsak

New Around Here
Thanks guys. Putting a figure in the WAN MTU sorted it. I didn't think that was necessary as it is in the optional(?) ISP special requirements section.
 

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