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| Type | Code | Description |
| 0 -Echo-Reply | 0 | Echo Reply |
| 3 -Destination Unreachable | 0 | Network unreachable |
| 1 |
Host unreachable |
|
| 2 | Protocol unreachable | |
| 3 | Port unreachable | |
| 4 | Fragmentation needed and DF (don't fragment flag) set | |
| 5 | Source route failed | |
| 6 | Destination network unknown | |
| 7 | Destination host unknown | |
| 8 | Source host isolated | |
| 9 | Communication with destination network administratively prohibited | |
| 10 | Communication with destination host administratively prohibited | |
| 11 | Network unreachable for type of service | |
| 12 | Host unreachable for type of service | |
| 13 | Prohibited by filtering | |
| 14 | Host precedence violation | |
| 15 | Precedence cutoff | |
| 4 -Source Quench | 0 | Source Quench |
| 5- Redirect | 0 | Redirect datagrams for the Network |
| 1 | Redirect datagrams for the Host | |
| 2 | Redirect datagrams for the Type of Service and Network | |
| 3 | Redirect datagrams for the Type of Service and Host | |
| 6 - alternate | 0 | alternate host address |
| 8- echo-request | 0 | Echo Request |
| 9 - router | 0 | Router Advertisement |
| 10 - router | 0 | Router Solicitation |
| 11 -Time Exceeded | 0 | Time to live exceeded in transit |
| 1 | Fragment reassembly time exceeded | |
| 12 -Parameter Problem | 0 | Pointer indicates the error |
| 1 | Required option is missing | |
| 2 | Bad Length | |
| 13 - timestamp | 0 | Timestamp Request |
| 14 - timestamp | 0 | Timestamp Reply |
| 15 - information | 0 | Info Request |
| 16 - information | 0 | Info Reply |
| 17 - mask | 0 | Address Mask Request |
| 18 - mask | 0 | Address Mask Reply |
| 30 - Traceroute | 0 | traceroute-forwarded |
| 1 | packet-discarded | |
| 31 - Datagram | 0 | datagram conversion error |
| 32 - Mobile | 0 | mobile host redirect |
| 33 - IPv6 request | 0 | IPv6 where are you |
| 34 - IPv6 reply | 0 | IPv6 here I am |
| 35 - mobile | 0 | mobile registration request |
| 36 - mobile | 0 | mobile registration reply |
| 37 - domain name | 0 | domain name request |
| 38 - domain name | 0 | domain name reply |
| 40 - Security | 0 | bad-spi |
| 1 | authentication failed | |
| 2 | decompression failed | |
| 3 | decryption failed | |
| 4 | need authentication | |
| 5 | need authorization |
IP Header (normally 20 bytes)
0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Version| IHL |Type of Service| Total Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Identification |Flags| Fragment Offset | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Time to Live | Protocol | Header Checksum | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Source Address | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Destination Address | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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