ESP Header Compression (EHC) defines a flexible framework to compress communications protected with IPsec/ESP. Compression and decompression is defined by EHC Rules orchestrated by EHC Strategies. The document specifies the Diet-ESP EHC Strategy and associated EHC Rules. Diet-ESP compresses up to 32 bytes per packet for traditional IPv6 VPN and up to 66 bytes for IPv6 VPN set over a single TCP or UDP session.