Thanks for the help.
It showed up for a few seconds but disappeared from session table.
205.211.168.200 is RAP IP. 10.1.100.16 is the master IP and 10.1.100.17 is the local.
Aruba-Master-A) #show datapath session table | include 4500
10.1.100.17 10.1.100.16 17 4500 4500 0/0 0 0 0 0/0/0 2b 7 1592 FC
10.1.100.16 10.1.100.17 17 4500 4500 0/0 0 0 1 0/0/0 2b 0 0 F
10.1.100.16 205.211.168.200 17 4500 32768 0/0 0 0 0 local 7 1 108 FDC
The following is firewall traffic log: 205.211.168.200 is RAP, 205.211.168.9 is public IP for master controller.
85.387941 arp who-has 205.211.168.9 tell 205.211.168.200
85.387950 arp reply 205.211.168.9 is-at 0:9:f:9:0:17
85.388198 205.211.168.200.32768 -> 205.211.168.9.4500: udp 390
85.390405 205.211.168.9.4500 -> 205.211.168.200.32768: udp 60
85.393347 205.211.168.200.32768 -> 205.211.168.9.4500: udp 418
85.396310 205.211.168.9.4500 -> 205.211.168.200.32768: udp 417
90.056041 arp who-has 205.211.168.200 tell 205.211.168.3
90.386191 arp who-has 205.211.168.200 tell 205.211.168.38
90.386826 arp reply 205.211.168.200 is-at 0:9:f:30:16:ba
107.168881 205.211.168.200 -> 205.211.168.9: icmp: 205.211.168.200 udp port 32768 unreachable
107.168910 205.211.168.200 -> 205.211.168.9: icmp: 205.211.168.200 udp port 32768 unreachable
119.189696 205.211.168.200 -> 205.211.168.9: icmp: 205.211.168.200 udp port 32768 unreachable
119.189942 205.211.168.200 -> 205.211.168.9: icmp: 205.211.168.200 udp port 32768 unreachable
Yong