Slow access of WLAN terminals

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Methods of troubleshooting the problem related to slow user access:

1. The wireless air interface is of poor quality.
- Use automatic channel optimization to properly plan the channels, and adjust the special areas to reduce overlapping channels.
- Adjust the power to ensure strong signals.
- Rule out other interference sources by using the WirelessMon or inSSIDer tool.
2. The NICs of some terminals cause the slow access. The access of certain users is slower than that of other users.
Replace the NICs or terminals.
3. The intermediate network causes the slow access.
- The problem of slow user association widely occurs in certain floors of buildings. It is probably the long latency of the intermediate network that causes the slow user access.
- Ping the APs, DHCP server, RADIUS server, and users from the AC to determine the locations where network latency occurs.
4. The load balancing causes the slow user access.
WLAN load balancing is used to balance the load of the clients on a WLAN, which ensures the performance and bandwidth of each client. This function is applied only in high-density wireless network environments.
If load balancing is enabled in sparsely-populated areas (each AP covers fewer than 15 users), it cannot function as expected, and slow user association speed may be caused due to APs' denial of user association.
- Use load balancing in some densely-populated scenarios.
- Change the load balancing threshold into a proper value to decrease the load balancing triggering frequency.
- Reduce the times of reconnection and shorten the time for users in denial due to load balancing reasons.

Other related questions:
When the AR router is used as the web server, the web platform page is displayed slowly
The possible causes and solutions are as follows: 1. A problem occurs on the local PC. Solution: Clear historical records and cache data on the local PC; upgrade the browser to the latest version or change the browser; upgrade flash player plug-in. 2. System software problem. Solution: Upgrade the router software. 3. The web access mode is incorrect. Solution: Change the web access mode to HTTPS.

How to prevent slow convergence on STP edge ports connected to terminals
Edge devices cannot participate in the STP calculation or respond to STP packets, causing slow convergence. You can use either of the following methods to prevent slow convergence on edge ports connected to user terminals or servers: 1. Run the stp disable command on the ports so that the ports always remain in the Forwarding state. 2. Run the stp edge-port enable command on the ports to configure them as edge ports, and then run the stp bpdu-protection command on the ports to enable BPDU protection. An edge port is in Forwarding state by default. The BPDU protection function shuts down an edge port after the port receives a BPDU. The edge ports that are shut down must be manually restored.

The speed of Internet access through PPPoE dialup is slow
The MTU of the PPPoE dialer interface is 1492 bytes. When the length of Layer 3 packets sent from this interface is larger than the MTU and non-fragmentation is configured, packets cannot be sent out and the Internet access speed is low. You can run the tcp adjust-mss value command on the dialer interface to modify the MSS (Max Segment Size) during TCP negotiation so that the packet length is shorter than the MTU of the dialer interface. Then packets can be properly processed and Internet access is smooth.
For example, change the MSS of the dialer interface to 1200.
<Huawei> system-view
[Huawei] interface dialer 0
[Huawei-Dialer0] tcp adjust-mss 1200

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