[Networking] 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 sollicitation     
      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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