ICMP : les messages d’erreur
Lorsqu’une passerelle émet un message ICMP de type destination inaccessible, le champ code décrit la nature de l’erreur :
- 0 Network Unreachable
- 1 Host Unreachable
- 2 Protocol Unreachable
- 3 Port Unreachable
- 4 Fragmentation Needed and DF set
- 5 Source Route Failed
- 6 Destination Network Unknown
- 7 Destination Host Unknown
- 8 Source Host Isolated
- 9 Communication with desination network administratively prohibited
- 10 Communication with desination host administratively prohibited
- 11 Network Unreachable for type of Service
- 12 Host Unreachable for type of Service