Section: 10.2 IP Fragmentation
Content: It is specified here how the fragmentation mechanism shall work with GTP-C. Fragmentation should be avoided if possible. Examples of fragmentation drawbacks are: - Fragmentation is inefficient, since the complete IP header is duplicated in each fragment. - If one fragment is lost, the complete packet has to be discarded. The reason is that no selective retransmission of fragments is possible. Path MTU discovery should be used, especially if GTPv2-C message is encapsulated with IPv6 header. The application should find out the path MTU, and thereby utilise more efficient fragmentation mechanisms.