Revision as of 19:04, 19 July 2006 by imported>mutante
ICMP is the Internet Control Message Protocol
You can read RFC 792 for a full explanation.
The well-known ping command is a type of ICMP request.
Packet Layout:
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
+-------------------------------+-------------------------------+
| Type | Code | Checksum |
+-------------------------------+-------------------------------+
| Identifier | Sequence Number |
+-------------------------------+-------------------------------+
| Data ...
+---------------------------------------------
Type 8 = echo request. Type 0 = echo reply.
Links: