Seamless roaming of wireless clients

[alexey]

Hello.

Please tell me how long it should take seamless roaming of wireless clients between access points? For us it takes 1 to 4 packet loss. We test the command ping. This is normal? Or packet loss should not be?

[McNulty]

1 or 2 dropped ping is acceptable when roaming.
4 seems a bit high to me.

[alexey]

Thank you very much

[alexey]

I did some tests, and that's what I saw.

If the wireless device is connected to a wireless network that belongs to vlan 1 (default) and ping another device or server connected to vlan 1 is seamless roaming operates without packet loss or a maximum of 1 packet loss. If the wireless device is connected to a wireless network belonging to any vlan (eg 10) during the ping server of vlan 1 or resource on the Internet packet loss in the seamless roaming can reach 4 package. At the same time when you start to ping a server connected to vlan 1 is the first packet is lost, and then starts to go ping. As if the need some time to do the routing.
I think it is not normal. Routing between vlan configured dynamically NAT. Maybe that's the problem?

[noobie]

where are you doing NAT (on each AP or at the controller)?
is your WLAN locally bridged or tunneled? (related to question above)

can you post your config please (remove all sensitive info)

[alexey]

1) NAT at the controller (Cluster Active-Standby)
2) All of the wireless network are tunneled to the controller

Сonfiguration in the attached files

[alexey]

Really nobody knows?

[alexey]

Hello.

Problem solved. Long migration between access points (up to 4 packet loss) got reduced by the following settings:

1) Configuration> Security> Wireless Firewall> Advanced Settings> un-tick L2 Stateful Packet Inspection> OK> Commit (Commit and Save)

2) Setting 802.11 Data Rates for different types of devices. The recommendations were taken from the document "best-practices-and-recommendations-rev-d"

After these settings, the packet loss decreased to 1 Ping (max 2) but in most cases, without loss. It has been observed Motorola mc3190 still migrates between access points with 1 packet loss.

[noobie]

if you have mc3190 or mc9190 (jedi radio) - they miss management frames on rates 5.5 and 11. Check and make sure you have them disabled.