A computer implemented method, apparatus, and computer usable program code for processing packets for transmission. A set of interface specific network buffers is identified from a plurality of buffers containing data for a packet received for transmission. A data structure describing the set of interface specific network buffers within the plurality of buffers is created, wherein a section in the data structure for an interface specific network buffer in the set of interface specific network buffers includes information about a piece of data in interface specific network buffer, wherein the data structure is used to process the packet for transmission.