Control Messages
Type | Code | Description |
---|---|---|
0 – Echo Reply | 0 | Echo reply (used to ping) |
1 and 2 | Reserved | |
3 – Destination Unreachable | 0 | Destination network unreachable |
1 | Destination host unreachable | |
2 | Destination protocol unreachable | |
3 | Destination port unreachable | |
4 | Fragmentation required, and DF flag set | |
5 | Source route failed | |
6 | Destination network unknown | |
7 | Destination host unknown | |
8 | Source host isolated | |
9 | Network administratively prohibited | |
10 | Host administratively prohibited | |
11 | Network unreachable for TOS | |
12 | Host unreachable for TOS | |
13 | Communication administratively prohibited | |
14 | Host Precedence Violation | |
15 | Precedence cutoff in effect | |
4 – Source Quench | 0 | Source quench (congestion control) |
5 – Redirect Message | 0 | Redirect Datagram for the Network |
1 | Redirect Datagram for the Host | |
2 | Redirect Datagram for the TOS & network | |
3 | Redirect Datagram for the TOS & host | |
6 | Alternate Host Address | |
7 | Reserved | |
8 – Echo Request | 0 | Echo request (used to ping) |
9 – Router Advertisement | 0 | Router Advertisement |
10 – Router Solicitation | 0 | Router discovery/selection/solicitation |
11 – Time Exceeded | 0 | TTL expired in transit |
1 | Fragment reassembly time exceeded | |
12 – Parameter Problem: Bad IP header | 0 | Pointer indicates the error |
1 | Missing a required option | |
2 | Bad length | |
13 – Timestamp | 0 | Timestamp |
14 – Timestamp Reply | 0 | Timestamp reply |
15 – Information Request | 0 | Information Request |
16 – Information Reply | 0 | Information Reply |
17 – Address Mask Request | 0 | Address Mask Request |
18 – Address Mask Reply | 0 | Address Mask Reply |
19 | Reserved for security | |
20 through 29 | Reserved for robustness experiment | |
30 – Traceroute | 0 | Information Request |
31 | Datagram Conversion Error | |
32 | Mobile Host Redirect | |
33 | Where-Are-You (originally meant for IPv6) | |
34 | Here-I-Am (originally meant for IPv6) | |
35 | Mobile Registration Request | |
36 | Mobile Registration Reply | |
37 | Domain Name Request | |
38 | Domain Name Reply | |
39 | SKIP Algorithm Discovery Protocol, Simple Key-Management for Internet Protocol | |
40 | Photuris, Security failures | |
41 | ICMP for experimental mobility protocols such as Seamoby | |
42 through 255 | Reserved |
Read more about this topic: ICMP Address Mask Reply
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