When I set Caps Datapath via a capsman bridge I can only ping -s 1182 to the manager and 1164 passing the bridge.
If I set local forwarding I can ping -s 16000 (Obviously fragmented) but it works.
There are some tunneling issue with capsman datapath that limits the actual MTU ?
We had similar issue when migrating from CRS to Cloud hosted router.
It looks there is an issue with CAPsMAN if you use “router on a stick” design where you wireless access-points are connected to same physical interface as your traffic goes. Even different vlans were used, it did not matter, we could not send larger packets.
Solution to our problem was to add additional interface to chr just for access-point traffic.