|Question||What keepalive or control traffic is sent between Instant AP and controller in IAP VPN setup?|
|Environment||This article applies to Aruba Instant Access Points.|
Instant AP sends 56 bytes of ICMP packet to controller every 5 seconds to detect whether tunnel is up or down, this value is configurable between 1-3600 seconds
Below are the configuration screenshots from web interface (GUI) and Command Line (CLI):
Login to Instant web interface and select "VPN from more options in main menu.
NOTE: "Commit Apply" command needs to be executed to save the changes from command line.
Screenshot below includes the ICMP packets of 56 Bytes, which is sent as a control/keepalive mechanism to controller to check if the VPN tunnel is active.