Comment by tarunupaday

1492 is the default frame size set by unifi on wan pppoe. You neither need to know such esoteric details nor need to set them. “It just works”

You can also modify your frame size: Unifi Devices - Gateway - Settings - MSS Clamping.

In my view , unifi gives you all the power and very good defaults at a very reasonable price. Their nearest competitors (eero on consumer side and ruckus / Aruba on business side) have less features and more price.