Why cannot an AP go online when the AR functions as an AC

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When the AR router functions as the AC and uses the WPA or WPA2 authentication, the terminal cannot go online
Root cause analysis: Through the analysis, when the AR is used as the AC and the Layer 3 interface is used as the downlink interface to connect to the AP, the AR does not support WPA or WPA2 authentication. Detailed information is as follows: 1. Interaction verification of WEP authentication is performed only between the AP and the STA. Therefore, when the AR uses the Layer 3 interface as the downlink interface to connect to the AP, the terminal can go online normally. 2. Layer 2 packets of WPA/WPA2 authentication are used and need to reach the AC. When the AR uses the Layer 3 interface as the downlink interface to connect to the AP, the terminal cannot go online because the Layer 3 interface on the AR cannot process the exchanged authentication packets. As a result, the terminal cannot go online. Summary and suggestion: In customer's networking, if the AR is used as the AC, you are advised to install the LAN card on the AR to connect to APs. In this case, the authentication mode is not limited.

An AP cannot go online. What is the troubleshooting roadmap
1. Check whether the number of APs exceeds the license specifications. 2. Check CAPWAP messages. 3. Check link information. 4. Check whether the configuration is delivered. 5. Check data flow information.

Why clients cannot go online when S series switch functions as a DHCPv6 relay agent
A PC may fail to go online when an S series switch functions as the DHCPv6 relay agent due to the following: If the PC is directly connected to the switch, check multicast packet statistics on the interface connected to the PC. If the inbound counter is 0, the firewall of the PC may have discarded DHCPv6 Request messages. In this case, disable the firewall and obtain an IP address again.

Which online AP upgrade mode does the AR support when it functions as an AC
The AR supports the FTP upgrade mode.

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