Loose Pings Over Wlan Exactly Every Minute

[mgibbons]

Hi

We run Aircontrol to manage about 30 devices.

It looks like Aircontrol polls every minute on the minute.

For about 10 seconds the device being polled (which is all of them) becomes unresponsive to pings and ssh commands from the WLAN side and then returns to Normal - always ok from the ethernet side. This is easy to see with pingplotter.

It appears that through traffic (certainly pings) are unaffected.

Can anything be done about this as it scews up our other monitoring software which gives false alerts. Is it a load issue when gathering info?

KR's

Mark

p.s we are using 5.1 and 5.1.1-wds fix

[mgibbons]

Hi

We run Aircontrol to manage about 30 devices.

It looks like Aircontrol polls every minute on the minute.

For about 10 seconds the device being polled (which is all of them) becomes unresponsive to pings and ssh commands from the WLAN side and then returns to Normal - always ok from the ethernet side. This is easy to see with pingplotter.

It appears that through traffic (certainly pings) are unaffected.

Can anything be done about this as it scews up our other monitoring software which gives false alerts. Is it a load issue when gathering info?

KR's

Mark

p.s we are using 5.1 and 5.1.1-wds fix

Any chance of an acknowledgement or comment on this from UBNT?

[UBNT-Thomas]

AirControl does not poll, except for the device that is currently selected in the details panel. All managed devices will report to AirControl via HTTP at a configurable interval (deviceHeartbeatIntervalSeconds in the settings page).

The default value for that is 30s.

[mgibbons]

AirControl does not poll, except for the device that is currently selected in the details panel. All managed devices will report to AirControl via HTTP at a configurable interval (deviceHeartbeatIntervalSeconds in the settings page).

The default value for that is 30s.

Ok it is the "enable Device Discovery Background Scan" that causes the problem.

With this switched off everything is fine.

As soon as it is on, exactly on the minute every minute, we loose pings and ssh to devices on the wireless network - packets are lost for about 5 seconds.

Can you please suggest what could be causing this.

Mark

[UBNT-Thomas]

Mark,

The background auto-scan will send a UDP broadcast on every NIC attached to the host running AC every minute. This is to discover devices added to local subnet(s). You can accomplish the same by hitting the scan button manually when needed once you turn this setting off.

One potential issue could be broadcast loops in your network. This depends on the NIC setup of the AirControl server and your network. You should be able to test the broadcast behavior with any other tool that allows you to send a UDP datagram on all interfaces simultaneously.

Thomas