(v_ipv4Packet.ipv4Hdr.destinationAddress==PX_HOST_V4_LIST_FTP[v_host].dstAddress)and// containing destination address indicating a public IPv4 address (FTP server address)
(oct2int(substr(v_ipv4Packet.ipv4Payload.rawPacket,2,2))==PX_HOST_V4_LIST_FTP[v_host].dstPort)// containing TCP payload indicating port number 20