ICMP Address Mask Request
Encyclopedia
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:
Recipients should reply to this message with an Address Mask Reply
message.
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...
query message, normally sent by a host
Server (computing)
In the context of client-server architecture, a server is a computer program running to serve the requests of other programs, the "clients". Thus, the "server" performs some computational task on behalf of "clients"...
to a router in order to obtain 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 = 17 | Code = 0 | Header Checksum |
Identifier |
Sequence Number |
Address Mask |
- Type must be set to 17.
- Code must be set to 0.
- The Address Mask can be set to 0.
Recipients should reply to this message with an Address Mask Reply
ICMP Address Mask Reply
Address Mask Reply is an ICMP message, used to reply to an Address Mask Request message withan appropriate subnet mask.Message Format: * Type must be set to 18.* Code must be set to 0.* The Address Mask should be set to the subnet mask....
message.