| Type Number | iptables mnemonic | Type description |
|---|---|---|
| 0 | echo-reply | Echo Reply |
| 3 | destination-unreachable | Destination Unreachable |
| 4 | source-quench | Source Quench |
| 5 | redirect | Redirect |
| 8 | echo-request | Echo Request |
| 11 | time-exceeded | Time Exceeded |
| 12 | parameter-problem | Parameter Problem |
| 13 | timestamp-request | Timestamp request |
| 14 | timestamp-reply | Timestamp reply |
| 15 | none | Information Request |
| 16 | none | Information Reply |
| 17 | address-mask-request | Address Mask Request |
| 18 | address-mask-reply | Address Mask Reply |