Public Enum ICMPType
        ICMP_ECHO_REPLY = 0
        ICMP_DESTINATION_UNREACHABLE = 3
        ICMP_REDIRECT = 5
        'ICMP_ECHO_REQUEST = 8 
        ICMP_TIME_EXCEEDED = 11
        ICMP_PARAMETER_PROBLEM = 12
        ICMP_TIMESTAMP_REQUEST = 13
        ICMP_TIMESTAMP_REPLY = 14
        'EchoReply = 0 
        'Unreachable = 3 
        Echo = 8
    End Enum