[프로토콜 헤더] ICMP 헤더

2022. 3. 19. 11:51

[프로토콜 헤더] ICMP 헤더

Type	Code
0	Echo Reply (에코 응답)
3	Destination Unreachable (목적지 도달 불가)
	0	Net Unreachable
	1	Host Unreachable
	2	Protocol Unreachable
	3	Port Unreachable
	4	Fragmentation reuired, and DF set
	5	Source Route Failed
	6	Destination Network Unknown
	7	Destination Host Unknown
	8	Source Host Isolated
	9	Network Administratively Prohibited
	10	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
4	Source Quench (발신 억제) * 표준에서 제외됨.
5	Redirect (재지정)
	0	Redirect for network
	1	Redirect for host
	2	Redirect for TOS and network
	3	Redirect for TOS and host
8	Echo Request (에코 요청)
9	Router Advertisement
10	Router Selection
11	Time Exceded (시간 초과) * 패킷이 루프를 돌거나 과밀발생, 타이머 값이 너무 낮게 설정된 경우 발생
	0	TTL Exceeded
	1	Fragment Reassembly Time Exceeded
12	Parameter Problem (매개변수 문제)
	0	Pointer Problem
	1	Missing a Required Operand
	2	Bad Length
13	Timestamp
14	Timestamp Reply
15	Infromation Request
16	Infromation Reply
17	Address Mask Request
18	Address Mast Reply

ICMP 특징