We have several banking branch. All of them connect to Data Centre with MPLS links via GRE Tunnel and for Backup connection; they connect to DC via WiMAX. We should set MTU 1400 on these MPLS and WiMAX interfaces because of the nature of MPLS & WiMAX. If we use TCP protocol for data transmission, we should set the DF bit ZERO. But the problem happens when we want to use UDP protocol with packet size greater than 1500 bytes for some of our applications.
these packets can't be reassemble via servers and we are forced to set virtual reassembly command in all of MPLS and WiMAX links, but I don't think it could be the best solution regarding to Routers load and cpu usage.
Could you pls help me according to this subject.