Revision as of 13:46, 10 February 2008 by imported>mutante (Tabelle der ICMP-Meldungstypen)
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:
Using ICMP tunneling to steal Internet
ICMP-Meldungstypen
| Nummer | Meldung |
|---|---|
| 0 | Echo-Antwort |
| 3 | Ziel nicht erreichbar |
| 4 | Quellreduktion |
| 5 | Umleitung / Änderungsanfrage |
| 8 | Echo-Anfrage |
| 9 | Router-Angebot |
| 10 | Router-Auswahl |
| 11 | Zeitüberschreitung |
| 12 | Parameterproblem |
| 13 | Zeitangabeanfrage |
| 14 | Zeitangabeantwort |
| 15 | Informationsanfrage |
| 16 | Informationsantwort |
| 17 | Adressmaskenanfrage |
| 18 | Adressmaskenantwort |