 The RDG client responds once again with a Client Hello packet containing the received cookie, which will initiate the DTLS handshake (RFC6347 Section 4.2).   Figure 1: Initiation of the DTLS handshake between RDG client and server  Figure 2: RDG client and server handshake phase (Source: [MS-TSGU] Section 1.3.3.1.1)