1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+---------------+---------------+---------------+---------------+
|    Version    |  PacketType   |         PacketLength          |
+---------------+---------------+-------------+-+---------------+
|    HopLimit   |   ReturnCode  | Reserved(MBZ) | HeaderLength  |
+===============+===============+=============+=+===============+
/                    Request header block TLV                   /
+---------------+---------------+---------------+---------------+
/                               .                               /
/                               .                               /
/                      n Report block TLVs                      /
/                               .                               /
/                               .                               /
+===============+===============+===============+===============+
|      Type (=T_DISCOVERY)      |         MessageLength         |
+---------------+---------------+---------------+---------------+
|            T_NAME             |             Length            |
+---------------+---------------+---------------+---------------+
/   Name segment TLVs (name prefix specified by CCNinfo user)   /
+---------------+---------------+---------------+---------------+
/                       Request block TLV                       /
+---------------+---------------+---------------+---------------+
/                        Reply block TLV                        /
+---------------+---------------+---------------+---------------+
/                     Reply sub-block TLV 1                     /
+---------------+---------------+---------------+---------------+
/                               .                               /
/                               .                               /
+---------------+---------------+---------------+---------------+
/                     Reply sub-block TLV k                     /
+---------------+---------------+---------------+---------------+
/ Optional CCNx ValidationAlgorithm TLV                         /
+---------------+---------------+---------------+---------------+
/ Optional CCNx ValidationPayload TLV (ValidationAlg required)  /
+---------------+---------------+---------------+---------------+