I've notice that once the client move from current AP to other AP will have the DHCP request to the DHCP server and the PING to WLAN gateway is time-out for 1 package.
This is normal & missing one packet is not a big issue in this scenario.
I'm not so sure dose it the normal for L2 roaming?
If you have multiple WLC and they are in two different routing doamin (ie WLAN is mapped to two different subnet/vlan on those 2 WLCs), then only L3 roaming comes into place. Otherwise every roam is L2
How can I check the L2 roaming is working?
The best way is taking over the air packet capture on the current AP channel & Target AP channel. This is the best document to go through to understand what roaming scenario the client is taking (since you configure 802.1X, CCKM & FT on same SSID)
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