类型值 类型说明 代码值 代码说明

8

Echo

0

Echo request

0

Echo Reply

0

Echo reply

3

Destination Unreachable

0

Destination network unreachable

-

-

1

Destination host unreachable

-

-

2

Destination protocol unreachable

-

-

3

Destination port unreachable

-

-

4

Fragmentation required, and DF flag 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

-

-

14

Host Precedence Violation

15

Precedence cutoff in effect

4

Source Quench

0

Source quench (congestion control)

5

Redirect Message

0

Redirect Datagram for the Network

-

-

1

Redirect Datagram for the Host

-

-

2

Redirect Datagram for the TOS & network

-

-

3

Redirect Datagram for the TOS & host

9

Router Advertisement

0

Router Advertisement

10

Router Solicitation

0

Router discovery/selection/solicitation

11

Time Exceeded

0

TTL expired in transit

-

-

1

Fragment reassembly time exceeded

12

Parameter Problem: Bad IP header

0

Pointer indicates the error

-

-

1

Missing a required option

-

-

2

Bad length

13

Timestamp

0

Timestamp

14

Timestamp Reply

0

Timestamp reply

15

Information Request

0

Information request

16

Information Reply

0

Information reply

17

Address Mask Reques

0

Address mask request

18

Address Mask Reply

0

Address mask reply

30

Traceroute

0

Information request