Is it possible to achieve 1500 byte MTU at the end host connections ignoring fragmentation overhead in this simple scenario using GRE. I would like to configure R1 and R2 to do the fragmentation silently and present this network as standard MTU 1500 byte network between this 2 hosts. the vendor is HPE comware and I'm missing the dfbit enable command under tunnel, anyway i'm trying to clarify is this doable because every manual online is focused on performance issue and guide to go with lower mtu that goes un fragmented between this sites. In my case i would like to abstract a 1500 bytes spanned network over a lower mtu overlay network.
interface Tunnel2 mode gre
ip address 10.0.12.1 255.255.255.0
rip 1 enable
ip mtu 1500