★ Client cannot connect to the WIFI SSID / cannot go online
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Network Topology
<ap><poesw><ac><coresw><fw>
Problem Description
ap radio bind a very simple servcice-template like this:
# wlan service-template test
ssid test
vlan 2
service-template enable
#
Client phone/laptop can find the ssid test, when connect to it, status: connecting > fail, and cannot get a ip from dhcp server.
in AC cannot found the client.
display wlan clinet
null.
Process Analysis
display wlan ap all, found the ap online. capwap tunnel between ac and ap is up.
display wlan ap n xxxx verbose
We found that
UDP data port number : N/A
CAPWAP data-tunnel status : Down
We found that the CAPWAP data-tunnel have some problem.
Controller did not receive any capwap_data. show the data tunnel is down.
there are a few reason might cause this problem:
1. there are fw between ac and ap, and fw deny the udp port(30400~30900 or bigger) of capwap datatunnel. Not only should troubleshoot the physical topology, but also should pay attention to the traffic path.
2. there are a another ac （ac or embedded ac）, the ac in the path might process the data tunnel problem and will not forward it to the real ac.
3. the route from ap to the ac and the route from ac to ap is not the same.
Solution
1. there are fw between ac and ap, and fw deny the udp port(30400~30900 or bigger) of capwap datatunnel. Not only should troubleshoot the physical topology, but also should pay attention to the traffic path.
> permit the udp port for ap.
2. there are a another ac （ac or embedded ac）, the ac in the path might process the data tunnel problem and will not forward it to the real ac.
>remove the ac or uninstall the UWW function for SW.
3. the route from ap to the ac and the route from ac to ap is not the same.