A.3 ICMP Message Types

ICMP message types of interest from a remote security assessment perspective are listed in Table A-3. Both the message types and individual codes are listed, along with details of RFCs and other standards in which these message types are discussed.

Table A-3. ICMP message types

Type

Code

Notes

0

0

Echo reply (RFC 792)

3

0

Destination network unreachable

3

1

Destination host unreachable

3

2

Destination protocol unreachable

3

3

Destination port unreachable

3

4

Fragmentation required, but don't fragment bit was set

3

5

Source route failed

3

6

Destination network unknown

3

7

Destination host unknown

3

8

Source host isolated

3

9

Communication with destination network is administratively prohibited

3

10

Communication with destination host is administratively prohibited

3

11

Destination network unreachable for type of service

3

12

Destination host unreachable for type of service

3

13

Communication administratively prohibited (RFC 1812)

3

14

Host precedence violation (RFC 1812)

3

15

Precedence cutoff in effect (RFC 1812)

4

0

Source quench (RFC 792)

5

0

Redirect datagram for the network or subnet

5

1

Redirect datagram for the host

5

2

Redirect datagram for the type of service and network

5

3

Redirect datagram for the type of service and host

8

0

Echo request (RFC 792)

9

0

Normal router advertisement (RFC 1256)

9

16

Does not route common traffic (RFC 2002)

11

0

Time to live (TTL) exceeded in transit (RFC 792)

11

1

Fragment reassembly time exceeded (RFC 792)

13

0

Timestamp request (RFC 792)

14

0

Timestamp reply (RFC 792)

15

0

Information request (RFC 792)

16

0

Information reply (RFC 792)

17

0

Address mask request (RFC 950)

18

0

Address mask reply (RFC 950)

30

0

Traceroute (RFC 1393)



     
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