ICMP Address Mask Reply
Encyclopedia
Address Mask Reply is an ICMP
message, used to reply to an Address Mask Request
message with
an appropriate subnet mask.
Message Format:
Internet Control Message Protocol
The Internet Control Message Protocol is one of the core protocols of the Internet Protocol Suite. It is chiefly used by the operating systems of networked computers to send error messages indicating, for example, that a requested service is not available or that a host or router could not be...
message, used to reply to an Address Mask Request
ICMP Address Mask Request
Address Mask Request is an ICMP query message, normally sent by a host to a router in order to obtain an appropriate subnet mask.Message Format: * Type must be set to 17.* Code must be set to 0.* The Address Mask can be set to 0....
message with
an appropriate subnet mask.
Message Format:
| 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
| Type = 18 | Code = 0 | Header Checksum |
Identifier |
Sequence Number |
Address Mask |
- Type must be set to 18.
- Code must be set to 0.
- The Address Mask should be set to the subnet mask.