Appendix B: Common IP Protocol Numbers
These are some of the more common IP Protocols, for all follow the link after the table.
Decimal | Keyword | Description |
| Reference | |
|
|
|
| ||
1 | ICMP | Internet Control Message | RFC792 | ||
2 | IGMP | Internet Group Management | RFC1112 | ||
3 | GGP | RFC823 | |||
4 | IP | IP in IP (encapsulation) | RFC2003 | ||
5 | ST | Stream |
| RFC1190, RFC1819 | |
6 | TCP | Transmission Control | RFC793 | ||
8 | EGP | Exterior Gateway Protocol | RFC888 | ||
17 | UDP | User Datagram |
| RFC768 | |
47 | GRE | General | Routing |
| |
|
| Encapsulation |
|
| |
50 | ESP | Encapsulation | Security | RFC2406 | |
|
| Payload |
|
| |
51 | AH | Authentication Header | RFC2402 | ||
108 | IPComp | I IP | Payload | Compression | RFC2393 |
|
| Protocol |
|
| |
112 | VRRP | Virtual | Router | Redundancy |
|
|
| Protocol |
|
| |
115 | L2TP | Layer Two Tunneling Protocol |
|
Source: