DHCP decline message (DHCPDECLINE)

A DHCP decline message is a message sent by a DHCP client to a DHCP server to decline the offer of an IP address on the network. This message is used when the client detects a potential conflict because the IP address is found to be already in use on the network. The DHCP decline message name isDHCPDECLINE.

The DHCP decline message is sent in response to a DHCP offer message from the DHCP server. The DHCP offer message contains the IP address, subnet mask, default gateway, and other configuration information for the client.

If the client detects a potential conflict with the IP address, it will send a DHCP decline message to the DHCP server. The DHCP decline message will contain the following information:

  • The IP address that the client is declining.
  • The reason for the decline.

The DHCP server will then remove the IP address from its pool of available addresses.

Here is an example of a DHCP decline message:

DHCPDECLINE
MessageType: 5
TransactionID: 0x12345678
IPAddress: 192.168.1.10
Reason: Address already in use

The MessageType field of the DHCP decline message is set to 5. The TransactionID field is the same as the TransactionID field of the DHCP offer message that the client is declining. The IPAddress field is the IP address that the client is declining. The Reason field is the reason for the decline. In this example, the reason is that the IP address is already in use.

The DHCP decline message is a valuable tool for preventing IP address conflicts on a network. If a client detects that an IP address is already in use, it can send a DHCP decline message to the DHCP server to prevent the conflict from occurring.

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