IMCP Tipos e codigos

ICMP Types and Codes
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