When using a division of P2P technology, request to open all the UDP port, can't do, otherwise it will cause the failure of P2P make hole,
But many under the network environment, for the sake of safety, it is impossible to open all the UDP, can only open fixed UDP port,
Really need to open all, please use the P2P UDP port? Open several fixed is workable?
This kind of situation, how to deal with?