Note that (pedantically) network_device_mtu wants to be 1 encap less than the *minimum* MTU in your cluster, because that is the *maximum* MTU of any packet you can guarantee to be able to forward. That's not necessarily same as 1 encap less than the local MTU; it may be smaller.
Note that (pedantically) network_device_mtu wants to be 1 encap less than the *minimum* MTU in your cluster, because that is the *maximum* MTU of any packet you can guarantee to be able to forward. That's not necessarily same as 1 encap less than the local MTU; it may be smaller.
Encaps are weird.