ICMP Messages

This appendix table describes the association between ICMP type/code couples and ICMP messages.

ICMP Type	ICMP Code	ICMP Message
0	0	Echo Reply
3	0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15	Network Unreachable Host Unreachable Protocol Unreachable Port Unreachable Fragmentation Needed and Don’t Fragment was Set Source Route Failed Destination Network Unknown Destination Host Unknown Source Host Isolated Communication with Destination Network is Administratively Prohibited Communication with Destination Host is Administratively Prohibited Destination Network Unreachable for Type of Service Destination Host Unreachable for Type of Service Communication Administratively Prohibited Host Precedence Violation Precedence cutoff in effect
4	0	Source Quench
5	0 1 2 3	Redirect Datagram for the Network (or subnet) Redirect Datagram for the Host Redirect Datagram for the Type of Service and Network Redirect Datagram for the Type of Service and Host
6	0	Alternate Address for Host
8	0	Echo
9	0 16	Normal router advertisement Does not route common traffic
10	0	Router Selection
11	0 1	Time to Live exceeded in Transit Fragment Reassembly Time Exceeded
12	0 1 2	Pointer indicates the error Missing a Required Option Bad Length
13	0	Timestamp
14	0	Timestamp Reply
15	0	Information Request
16	0	Information Reply
17	0	Address Mask Request
18	0	Address Mask Reply
19	0	Reserved (for Security)
20	0	Reserved (for Robustness Experiment)
21	0	Reserved (for Robustness Experiment)
22	0	Reserved (for Robustness Experiment)
23	0	Reserved (for Robustness Experiment)
24	0	Reserved (for Robustness Experiment)
25	0	Reserved (for Robustness Experiment)
26	0	Reserved (for Robustness Experiment)
27	0	Reserved (for Robustness Experiment)
28	0	Reserved (for Robustness Experiment)
29	0	Reserved (for Robustness Experiment)
30	0	Traceroute
31	0	Datagram Conversion Error
32	0	Mobile Host Redirect
33	0	IPv6 Where-Are-You
34	0	IPv6 I-Am-Here
35	0	Mobile Registration Request
36	0	Mobile Registration Reply
39	0	SKIP
40	0 1 2 3 4 5	Bad SPI Authentication Failed Decompression Failed Decryption Failed Need Authentication Need Authorization
128	0	IPv6 Echo Request
129	0	IPv6 Echo Reply
130	0	IPv6 Multicast Listener Query
131	0	IPv6 Multicast Listener Report
132	0	IPv6 Multicast Listener Done
133	0	IPv6 Router Solicitation
134	0	IPv6 Router Advertisement
135	0	IPv6 Neighbor Solicitation
136	0	IPv6 Neighbor Advertisement
137	0	IPv6 Redirect Message
138	0 1 255	Command Result Reset
139	0 1 2	Subject Subject or Empty Ipv4 Subject
140	0 1 2	Successful Refused Unknown
141	0	IPv6 Inverse Neighbor Discovery Solicitation Message
142	0	IPv6 Inverse Neighbor Discovery Advertisement Message
144	0	IPv6 Home Agent Address Discovery Request Message
145	0	IPv6 Home Agent Address Discovery Reply Message
146	0	IPv6 Mobile Prefix Solicitation
147	0	IPv6 Mobile Prefix Advertisement
148	0	IPv6 Certification Path Solicitation Message
149	0	IPv6 Certification Path Advertisement Message
151	0	IPv6 Multicast Router Advertisement
152	0	IPv6 Multicast Router Solicitation
153	0	IPv6 Multicast Router Termination
154	0	FMIPv6 Messages
253	0	RFC3692-style Experiment 1
254	0	RFC3692-style Experiment 2