8 bytesThis challenge packet is sent by the server wheneverit receives request from a host.The weird thing is, Ethereal sniffs a trailing garbage(8 bytes) with this packet.struct drcom_challenge{  struct drcom_serv_header serv_header;  u_int32_t challenge;} __attribute__ ((__packed__));pkt_type is 02 00.len is 8.challenge is challenge value.