TCP / IP 

ICMP


URL: http://www.absoluta.org
Data:  26/02/2000
Atualizado em: 26/02/2000
Responsavel: frank at absoluta.org


 

|<-----DATAGRAMA IP ---->|

IP header  (20 bytes) icmp message 
ip header tipo (1 byte)  codigo ( 1 byte)  checksum ( 2 bytes ) nao utilizado ( 4 bytes ) cabecalho IP + 8 bytes do pacote original

 
 
 
tipo codigo descricao
0 0 echo replay query
1 unassigned unassigned unassigned
2 unassigned unassigned unassigned
3
0 network unreachable
1 host unreachable
2 protocol unreachable
3 port unreachable
4 fragmentation needed but don't-fragment bit set
5 source route failed
6 destination network unknow ( obsoleto)
=> substituido pelo codigo 0
7 destination host unknow
8 source host isolated ( obsoleto )
=>RFC1812 - o roteador deve gerar 
      codigo 0 ou codigo 1
9 destination network administratively prohibited
10 destination host administratively prohibited
11 network unreachable for TOS
12 host unreachable for TOS
13 communication administratively prohibited by filtering
14 host precedence violation
15 precedence cutoff in effect

destination unreachable
error
4 0 source quench error
5
0 redirect for network
1 redirect for host
2 redirect for type-of-service and network
3 redirect for type-of-service and host
redirect error
6 0 alternate host address
7 unassigned unassigned unassigned
8 0 echo request query
9 0 router advertisement query
10 0 router solicitation query
11
0 time-to-live equals 0 during transit
1 type-of-service and reassembly
time exceeded error
12
0 IP header bad
1 required option missing
parameter problem error
13 0 timestamp request query
14 0 timestamp reply query
15 0 information request (obsoleto) query
16 0 information reply (obsoleto) query
17 0 address mask request query
18 0 address mask reply query
19
reserved (for security)
20-29
reserved (for robustness experiment)
30
traceroute
31
datagram conversion error
32
mobile host redirect
33
IPv6 where-are-you
34
IPv6 i-am-here
35
mobile registration request
36
mobile registration reply
37-255 unassigned unassigned unassigned









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