Source interface of the AC

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Source interface of the AC
An AC uses the IP address of the specified interface as the source IP address in WLAN scenarios. All APs connected to the AC can learn this source IP address and use the IP address to communicate with the AC.

-Create the IP address of the corresponding interface in advance. VLANIF 1 is not recommended because VLAN 1 is the management VLAN;
-Use the VRRP virtual IP or loopback IP address;
-Use the interface or IP address;
-The AC supports only one source interface. To modify the source interface configuration, run the undo wlan ac source {interface|ip address} or undo capwap source {interface|ip address} command to delete the existing configuration first;
-Note that all APs will be disconnected when the source interface configuration is deleted.

Configuration example of V200R003:
[HUAWEI]wlan
[HUAWEI-WLAN-view]wlan ac source interface loopback 1 
[HUAWEI-WLAN-view]wlan ac source interface vlanif 10
[HUAWEI-WLAN-view]wlan ac source ip address 192.168.1.1
Check the configuration.
Run the display wlan ac source interface command to view the source interface of the AC;
Run the display wlan ac source ip-address command to view the source IP address of the AC.

From V200R005C10, commands are changed and the view is changed to the system view: 
[HUAWEI]capwap source interface vlanif 10
[HUAWEI]capwap source interface loopback 1
[HUAWEI]capwap source ip address 192.168.1.1
Check the configuration.
Run the display capwap configuration command to check the source interface or source address of an AC.

Other related questions:
What is the function of a WLAN AC source or CAPWAP source
As a network element, an AC must be configured with an IP address for communication with other devices. The WLAN AC Source or CAPWAP Source parameter is used to assign an IP address to the AC. Generally, the IP address of the loopback interface or VLANIF interface serves as the AC source. In versions earlier than V200R005C00, WLAN AC Source is used. In V200R005C00 and later versions, WLAN AC Source is changed to CAPWAP Source.

Types of interfaces on WLAN devices
WLAN devices provide three types of interfaces: - An access interface can connect to a user host. - A hybrid interface can connect to either a user device or a switch. - A trunk interface can connect to a switch.

Does a firewall support source NAT on a switched interface
Yes. The FW only supports source NAT working in address pool mode on a switched interface. The switched mode is also called the transparent mode.

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