WLAN AC V200R019C00 Command Reference
This document describes all the configuration commands of the device, including the command function, syntax, parameters, views, default level, usage guidelines, examples, and related commands.
This document describes all the configuration commands of the device, including the command function, syntax, parameters, views, default level, usage guidelines, examples, and related commands.
dhcp server excluded-ip-address
Function
The dhcp server excluded-ip-address command specifies the range of IP addresses that cannot be automatically assigned to clients from an interface address pool.
The undo dhcp server excluded-ip-address command deletes the specified range of IP addresses that cannot be automatically assigned to clients from an interface address pool.
By default, all IP addresses in an address pool can be automatically assigned to clients.
Format
dhcp server excluded-ip-address start-ip-address [ end-ip-address ]
undo dhcp server excluded-ip-address start-ip-address [ end-ip-address ]
Parameters
Parameter |
Description |
Value |
|---|---|---|
start-ip-address |
Specifies the start IP address of the IP address segment where addresses cannot be automatically assigned to clients. |
The value is in dotted decimal notation. |
end-ip-address |
Specifies the end IP address of the IP address segment where addresses cannot be automatically assigned to clients. If end-ip-address is not specified, only the IP address corresponding to start-ip-address cannot be automatically assigned. |
The value is in dotted decimal notation. end-ip-address and start-ip-address must be on the same network segment and end-ip-address must be larger than start-ip-address. |
Usage Guidelines
Usage Scenario
The dhcp server excluded-ip-address command applies to DHCP servers. Fixed IP addresses are allocated to some specific hosts (such as the WWW server) on the network for a long time. If these hosts' IP addresses are overlapped with IP addresses in the address pool and the DHCP server allocates these overlapped IP addresses to other hosts, IP address conflicts may occur. To prevent such IP address conflicts, you need to exclude these IP addresses from being automatically assigned in the address pool.
You can run the dhcp server excluded-ip-address command to specify the IP addresses or the range of IP addresses that cannot be automatically assigned to clients in the interface address pool.
You can run the excluded-ip-address command to specify the IP addresses or the range of IP addresses that cannot be automatically assigned to clients in the global address pool.
Prerequisites
- The DHCP function has been enabled using the dhcp enable command in the system view.
IP addresses in the interface address pool have been configured using the ip address command.
The DHCP server function has been enabled on the interface using the dhcp select interface command.
Precautions
- IP addresses that cannot be automatically assigned must be in the address pool. If IP address range in the address pool is changed using the dhcp server ip-range command, IP addresses that are configured not to be automatically assigned must be within the new IP address range.
You do not need to exclude the gateway address configured using the dhcp server gateway-list command from being automatically allocated. The device automatically adds the gateway address into the list of IP addresses that cannot be automatically allocated.
You do not need to exclude the IP address of a server's interface connecting to a client from being automatically allocated. The device automatically sets the status of the interface IP address to Conflict during address assignment.
- If you run this command multiple times, you can specify multiple IP addresses or ranges of IP addresses that cannot be automatically assigned to clients from the specified address pool.
- You can run the display ip pool command to check the IP addresses in use in the current address pool, so that you can exclude the unused IP addresses from being automatically assigned to clients. If you need to exclude IP addresses in use from being automatically assigned to clients, run the reset ip pool command to reclaim these IP addresses first.
Example
<HUAWEI> system-view [HUAWEI] dhcp enable [HUAWEI] interface vlanif 100 [HUAWEI-Vlanif100] ip address 192.168.1.1 24 [HUAWEI-Vlanif100] dhcp select interface [HUAWEI-Vlanif100] dhcp server excluded-ip-address 192.168.1.1 192.168.1.20