from http://www.faqs.org/docs/iptables/icmptypes.html

Appendix C. ICMP types

This is a complete listing of all ICMP types:

Table C-1. ICMP types
TYPE CODE Description Query Error
0 0 Echo Reply x  
3 0 Network Unreachable   x
3 1 Host Unreachable   x
3 2 Protocol Unreachable   x
3 3 Port Unreachable   x
3 4 Fragmentation needed but no frag. bit set   x
3 5 Source routing failed   x
3 6 Destination network unknown   x
3 7 Destination host unknown   x
3 8 Source host isolated (obsolete)   x
3 9 Destination network administratively prohibited   x
3 10 Destination host administratively prohibited   x
3 11 Network unreachable for TOS   x
3 12 Host unreachable for TOS   x
3 13 Communication administratively prohibited by filtering   x
3 14 Host precedence violation   x
3 15 Precedence cutoff in effect   x
4 0 Source quench    
5 0 Redirect for network    
5 1 Redirect for host    
5 2 Redirect for TOS and network    
5 3 Redirect for TOS and host    
8 0 Echo request x  
9 0 Router advertisement    
10 0 Route solicitation    
11 0 TTL equals 0 during transit   x
11 1 TTL equals 0 during reassembly   x
12 0 IP header bad (catchall error)   x
12 1 Required options missing   x
13 0 Timestamp request (obsolete) x  
14   Timestamp reply (obsolete) x  
15 0 Information request (obsolete) x  
16 0 Information reply (obsolete) x  
17 0 Address mask request x  
18 0 Address mask reply x  

 

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Last modified: January 21, 2005