A computer-implemented method includes sending one or more network packets. Each of the one or more network packets includes a network packet header. The computer implemented method further includes receiving a negative acknowledgement list comprising the network packets not received. The computer-implemented method further includes, responsive to the receiving of a negative acknowledgment list: For each network packet of the negative acknowledgment list, transforming the network packet header into a modified packet header to yield a modified packet. The computer-implemented method further includes combining each modified packet into a modified packet list. The computer-implemented method further includes generating one or more repair packets. Each of the one or more repair packets further include a repair packet header and a portion of the modified packet list. The computer-implemented method further includes sending the one or more repair packets. A corresponding computer system and computer program product are also disclosed.