Configuration Guide Configuring DHCPConfiguring DHCP
4.4.4 Configuring Global Properties of DHCP Server
Configuration Effect
Enable a server with specific functions, for example, ping and compulsory NAK.
Notes
Configuring the command may cause exceptions on other servers.
Configuration Steps
Configuring Excluded IP Address
Optional. Configure some addresses or address ranges as unavailable.
Run the ip dhcp excluded-address command in global configuration mode.
Configuring Compulsory NAK Reply
Optional. A server replies to a wrong address request with a NAK packet.
Run the ip dhcp force-send-nak command in global configuration mode.
Configuring VRRP Status Monitoring
Optional. After configuration, DHCP packets are processed by the Master server.
Run the ip dhcp monitor-vrrp-state command in global configuration mode.
Configuring Ping Times
Optional. Check the address reachability with the ping command. The default is 2.
Run the ip dhcp ping packet command in global configuration mode.
Configuring Ping Timeout
Optional. Check the address reachability with the ping command. The default is 500 ms.
Run the ip dhcp ping timeout command in global configuration mode.
Refreshing Trusted ARP
Configure a DHCP server to refresh trusted ARPs according to the addresses assigned from an address pool
configured with the update arp command.
Run the ip dhcp refresh arp command in global configuration mode.
Detecting User Offline Detection
Configure a DHCP server to detect whether the client is offline or not. If a client does not get online after being offline
for a period, the address assigned to the client will be retrieved.
Run the ip dhcp server arp-detect command in global configuration mode.
Verification
Run the dhcp-server command, and check the configuration during address assignment.
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