Type:   Code:   Type/Code Name
-------------------------------------
0:              Echo Reply

3:              Unreachable
        0:      Network
        1:      Host
        2:      Protocol
        3:      Port
        4:      Need Fragment
        5:      Source Failed
        6:      Network Unknown
        7:      Host Unknown
        8:      Isolated
        9:      Network Prohibited
        10:     Host Prohibited
        11:     Type of Service Network
        12:     Type of Service Host
        13:     Filter Prohibited
        14:     Host Precedence
        15:     Precedence Cutoff

4:              Source Quench

5:              Redirect
        0:      Network Redirect
        1:      Host Redirect
        2:      Type of Service Network
        3:      Type of Serivce Host

8:              Echo Request

9:              Router Advertise

10:             Router Solicit

11:             Time Exceeded
        0:      In transit
        1:      Reassemble

12:             Parameter Problem
        1:      Option Absent

13:             Timestamp Request

14:             Timestamp Reply

17:             Mask Request

18:             Mask Reply