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Table C-1. ICMP types

TYPECODEDescriptionQueryErrorReference
Echo Replyx RFC792
3Network Unreachable xRFC792
31Host Unreachable xRFC792
32Protocol Unreachable xRFC792
33Port Unreachable xRFC792
34Fragmentation needed but no frag. bit set xRFC792
35Source routing failed xRFC792
36Destination network unknown xRFC792
37Destination host unknown xRFC792
38Source host isolated (obsolete) xRFC792
39Destination network administratively prohibited xRFC792
310Destination host administratively prohibited xRFC792
311Network unreachable for TOS xRFC792
312Host unreachable for TOS xRFC792
3
13Communication administratively prohibited by filtering xRFC1812
314Host precedence violation xRFC1812
315Precedence cutoff in effect xRFC1812
4Source quench  RFC792
5Redirect for network  RFC792
51Redirect for host   
52Redirect for TOS and network  RFC792
53Redirect for TOS and host  RFC792
8Echo requestx RFC792
9Router advertisement - Normal router advertisement  RFC1256
916Router advertisement - Does not route common traffic  RFC2002
10Route selection  RFC1256
11TTL equals 0 during transit xRFC792
111TTL equals 0 during reassembly xRFC792
12IP header bad (catchall error) xRFC792
121Required options missing xRFC1108
122IP Header bad length xRFC792
13Timestamp request (obsolete)x RFC792
14 Timestamp reply (obsolete)x RFC792
15Information request (obsolete)x RFC792
16Information reply (obsolete)x RFC792
17Address mask requestx RFC950
18Address mask replyx RFC950
20-29 Reserved for robustness experiment  Zaw-Sing Su
30Traceroutex RFC1393
31Datagram Conversion Error xRFC1475
32Mobile Host Redirect  David Johnson
33IPv6 Where-Are-Youx Bill Simpson
34IPv6 I-Am-Herex Bill Simpson
35Mobile Registration Requestx Bill Simpson
36Mobile Registration Replyx Bill Simpson
39SKIP  Tom Markson
40Photuris  RFC2521