Thursday, April 18, 2024

ICMP Types and Codes

Control messages

Control messages
TypeCodeStatusDescription
0 Echo0Echo reply (used to ping)
1 and 2unassignedReserved
3 – Destination Unreachable0Destination network unreachable
1Destination host unreachable
2Destination protocol unreachable
3Destination port unreachable
4Fragmentation required, and DF flag set
5Source route failed
6Destination network unknown
7Destination host unknown
8Source host isolated
9Network administratively prohibited
10Host administratively prohibited
11Network unreachable for ToS
12Host unreachable for ToS
13Communication administratively prohibited
14Host Precedence Violation
15Precedence cutoff in effect
4 – Source Quench0deprecatedSource quench (congestion control)
5 – Redirect Message0Redirect Datagram for the Network
1Redirect Datagram for the Host
2Redirect Datagram for the ToS & network
3Redirect Datagram for the ToS & host
6deprecatedAlternate Host Address
7unassignedReserved
8 – Echo Request0Echo request (used to ping)
9 – Router Advertisement0Router Advertisement
10 – Router Solicitation0Router discovery/selection/solicitation
11 – Time Exceeded0TTL expired in transit
1Fragment reassembly time exceeded
12 – Parameter Problem: Bad IP header0Pointer indicates the error
1Missing a required option
2Bad length
13 – Timestamp0Timestamp
14 – Timestamp Reply0Timestamp reply
15 – Information Request0deprecatedInformation Request
16 – Information Reply0deprecatedInformation Reply
17 – Address Mask Request0deprecatedAddress Mask Request
18 – Address Mask Reply0deprecatedAddress Mask Reply
19reservedReserved for security
20 through 29reservedReserved for robustness experiment
30 – Traceroute0deprecatedInformation Request
31deprecatedDatagram Conversion Error
32deprecatedMobile Host Redirect
33deprecatedWhere-Are-You (originally meant for IPv6)
34deprecatedHere-I-Am (originally meant for IPv6)
35deprecatedMobile Registration Request
36deprecatedMobile Registration Reply
37deprecatedDomain Name Request
38deprecatedDomain Name Reply
39deprecatedSKIP Algorithm Discovery Protocol, Simple Key-Management for Internet Protocol
40Photuris, Security failures
41experimentalICMP for experimental mobility protocols such as Seamoby [RFC4065]
42 through 252unassignedReserved
253experimentalRFC3692-style Experiment 1 (RFC 4727)
254experimentalRFC3692-style Experiment 2 (RFC 4727)
255reservedReserved
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Guru baranhttps://gbhackers.com
Gurubaran is a co-founder of Cyber Security News and GBHackers On Security. He has 10+ years of experience as a Security Consultant, Editor, and Analyst in cybersecurity, technology, and communications.

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