Packet capture from that RAP i am testing this
10:30:23.401391 IP 10.0.0.138.65111 > "MASTER IP".4500: UDP, length 390
10:30:28.469189 IP 10.0.0.138 > 10.0.0.1: ICMP echo request, id 3559, seq 0, length 64
10:30:28.469250 IP 10.0.0.1 > 10.0.0.138: ICMP echo reply, id 3559, seq 0, length 64
10:30:29.467000 IP 10.0.0.138 > 10.0.0.1: ICMP echo request, id 3559, seq 1, length 64
10:30:29.467026 IP 10.0.0.1 > 10.0.0.138: ICMP echo reply, id 3559, seq 1, length 64
10:30:29.758557 IP 10.0.0.138.65113 > "SLAVE IP".4500: UDP, length 423
10:30:29.764305 IP "SLAVE IP".4500 > 10.0.0.138.65113: UDP, length 60
10:30:29.767486 IP 10.0.0.138.65113 > "SLAVE IP".4500: UDP, length 451
10:30:29.774744 IP "SLAVE IP".4500 > 10.0.0.138.65113: UDP, length 525
10:30:31.863183 IP 10.0.0.138.65113 > "SLAVE IP".4500: UDP, length 530
10:30:31.863402 IP 10.0.0.138.65113 > "SLAVE IP".4500: UDP, length 530
10:30:31.863613 IP 10.0.0.138.65113 > "SLAVE IP".4500: UDP, length 530
10:30:31.863824 IP 10.0.0.138.65113 > "SLAVE IP".4500: UDP, length 530
10:30:31.864113 IP 10.0.0.138.65113 > "SLAVE IP".4500: UDP, length 208
10:30:31.877364 IP "SLAVE IP".4500 > 10.0.0.138.65113: UDP, length 80
10:30:31.951673 IP 10.0.0.138 > 10.0.0.1: ICMP echo request, id 3594, seq 0, length 64
10:30:31.951727 IP 10.0.0.1 > 10.0.0.138: ICMP echo reply, id 3594, seq 0, length 64
10:30:32.950762 IP 10.0.0.138 > 10.0.0.1: ICMP echo request, id 3594, seq 1, length 64
10:30:32.950786 IP 10.0.0.1 > 10.0.0.138: ICMP echo reply, id 3594, seq 1, length 64
10:30:33.234251 IP 10.0.0.138.65115 > "MASTER IP".4500: UDP, length 423
10:30:38.242922 IP 10.0.0.138.65115 > "MASTER IP".4500: UDP, length 423
10:30:43.248930 IP 10.0.0.138.65115 > "MASTER IP".4500: UDP, length 423
10:30:48.253844 IP 10.0.0.138.65115 > "MASTER IP".4500: UDP, length 423
10:32:47.584365 IP 10.0.0.1 > 10.0.0.138: ICMP echo request, id 12343, seq 0, length 28
10:32:48.588391 IP 10.0.0.1.67 > 10.0.0.138.68: UDP, length 300
10:32:48.594579 IP 10.0.0.1.67 > 10.0.0.138.68: UDP, length 300
10:33:22.080852 IP 10.0.0.138.68 > 10.0.0.1.67: UDP, length 490
10:33:22.081163 IP 10.0.0.1.67 > 10.0.0.138.68: UDP, length 300
10:33:23.756049 IP 10.0.0.138.60348 > "MASTER IP".4500: UDP, length 390
10:33:28.762417 IP 10.0.0.138.60348 > "MASTER IP".4500: UDP, length 390
10:33:33.768466 IP 10.0.0.138.60348 > "MASTER IP".4500: UDP, length 390
10:33:38.774495 IP 10.0.0.138.60348 > "MASTER IP".4500: UDP, length 390
10:33:43.853466 IP 10.0.0.138 > 10.0.0.1: ICMP echo request, id 2965, seq 0, length 64
10:33:43.853528 IP 10.0.0.1 > 10.0.0.138: ICMP echo reply, id 2965, seq 0, length 64
10:33:44.851146 IP 10.0.0.138 > 10.0.0.1: ICMP echo request, id 2965, seq 1, length 64
10:33:44.851174 IP 10.0.0.1 > 10.0.0.138: ICMP echo reply, id 2965, seq 1, length 64
10:33:45.144146 IP 10.0.0.138.60350 > "MASTER IP".4500: UDP, length 423
10:33:50.150658 IP 10.0.0.138.60350 > "MASTER IP".4500: UDP, length 423
10:33:55.154691 IP 10.0.0.138.60350 > "MASTER IP".4500: UDP, length 423
10:34:00.157949 IP 10.0.0.138.60350 > "MASTER IP".4500: UDP, length 423
10:34:05.225045 IP 10.0.0.138 > 10.0.0.1: ICMP echo request, id 2998, seq 0, length 64
10:34:05.225104 IP 10.0.0.1 > 10.0.0.138: ICMP echo reply, id 2998, seq 0, length 64
10:34:06.221042 IP 10.0.0.138 > 10.0.0.1: ICMP echo request, id 2998, seq 1, length 64
10:34:06.221070 IP 10.0.0.1 > 10.0.0.138: ICMP echo reply, id 2998, seq 1, length 64
10:34:06.523337 IP 10.0.0.138.60352 > "SLAVE IP".4500: UDP, length 423
10:34:06.529398 IP "SLAVE IP".4500 > 10.0.0.138.60352: UDP, length 60
10:34:06.532534 IP 10.0.0.138.60352 > "SLAVE IP".4500: UDP, length 451
10:34:06.540249 IP "SLAVE IP".4500 > 10.0.0.138.60352: UDP, length 525
10:34:08.629071 IP 10.0.0.138.60352 > "SLAVE IP".4500: UDP, length 530
10:34:08.629292 IP 10.0.0.138.60352 > "SLAVE IP".4500: UDP, length 530
10:34:08.629503 IP 10.0.0.138.60352 > "SLAVE IP".4500: UDP, length 530
10:34:08.629714 IP 10.0.0.138.60352 > "SLAVE IP".4500: UDP, length 530
10:34:08.630005 IP 10.0.0.138.60352 > "SLAVE IP".4500: UDP, length 208
10:34:08.644193 IP "SLAVE IP".4500 > 10.0.0.138.60352: UDP, length 80
10:34:08.723568 IP 10.0.0.138 > 10.0.0.1: ICMP echo request, id 3034, seq 0, length 64
10:34:08.723629 IP 10.0.0.1 > 10.0.0.138: ICMP echo reply, id 3034, seq 0, length 64
10:34:09.721737 IP 10.0.0.138 > 10.0.0.1: ICMP echo request, id 3034, seq 1, length 64
10:34:09.721764 IP 10.0.0.1 > 10.0.0.138: ICMP echo reply, id 3034, seq 1, length 64
10:34:10.013730 IP 10.0.0.138.60354 > "MASTER IP".4500: UDP, length 423
10:34:15.020033 IP 10.0.0.138.60354 > "MASTER IP".4500: UDP, length 423
10:34:20.026057 IP 10.0.0.138.60354 > "MASTER IP".4500: UDP, length 423
10:34:25.032044 IP 10.0.0.138.60354 > "MASTER IP".4500: UDP, length 423
10:36:23.618483 IP 10.0.0.1 > 10.0.0.138: ICMP echo request, id 12343, seq 0, length 28
10:36:24.620345 IP 10.0.0.1.67 > 10.0.0.138.68: UDP, length 300
10:36:24.629925 IP 10.0.0.1.67 > 10.0.0.138.68: UDP, length 300
10:36:58.137257 IP 10.0.0.138.68 > 10.0.0.1.67: UDP, length 490
10:36:58.137576 IP 10.0.0.1.67 > 10.0.0.138.68: UDP, length 300
10:36:59.813133 IP 10.0.0.138.56025 > "MASTER IP".4500: UDP, length 390
10:37:04.819681 IP 10.0.0.138.56025 > "MASTER IP".4500: UDP, length 390
10:37:09.823702 IP 10.0.0.138.56025 > "MASTER IP".4500: UDP, length 390
10:37:14.824977 IP 10.0.0.138.56025 > "MASTER IP".4500: UDP, length 390
10:37:19.893167 IP 10.0.0.138 > 10.0.0.1: ICMP echo request, id 2964, seq 0, length 64
10:37:19.893232 IP 10.0.0.1 > 10.0.0.138: ICMP echo reply, id 2964, seq 0, length 64
10:37:20.889076 IP 10.0.0.138 > 10.0.0.1: ICMP echo request, id 2964, seq 1, length 64
10:37:20.889105 IP 10.0.0.1 > 10.0.0.138: ICMP echo reply, id 2964, seq 1, length 64
10:37:21.176189 IP 10.0.0.138.56027 > "MASTER IP".4500: UDP, length 423
10:37:26.182709 IP 10.0.0.138.56027 > "MASTER IP".4500: UDP, length 423
10:37:31.188715 IP 10.0.0.138.56027 > "MASTER IP".4500: UDP, length 423
10:37:36.191999 IP 10.0.0.138.56027 > "MASTER IP".4500: UDP, length 423
10:37:41.259691 IP 10.0.0.138 > 10.0.0.1: ICMP echo request, id 2998, seq 0, length 64
10:37:41.259752 IP 10.0.0.1 > 10.0.0.138: ICMP echo reply, id 2998, seq 0, length 64
10:37:42.257591 IP 10.0.0.138 > 10.0.0.1: ICMP echo request, id 2998, seq 1, length 64
10:37:42.257615 IP 10.0.0.1 > 10.0.0.138: ICMP echo reply, id 2998, seq 1, length 64
10:37:42.543101 IP 10.0.0.138.56029 > "SLAVE IP".4500: UDP, length 423
10:37:42.549202 IP "SLAVE IP".4500 > 10.0.0.138.56029: UDP, length 60
10:37:42.552281 IP 10.0.0.138.56029 > "SLAVE IP".4500: UDP, length 451
10:37:42.559468 IP "SLAVE IP".4500 > 10.0.0.138.56029: UDP, length 525
10:37:44.648489 IP 10.0.0.138.56029 > "SLAVE IP".4500: UDP, length 530
10:37:44.648730 IP 10.0.0.138.56029 > "SLAVE IP".4500: UDP, length 530
10:37:44.648946 IP 10.0.0.138.56029 > "SLAVE IP".4500: UDP, length 530
10:37:44.649187 IP 10.0.0.138.56029 > "SLAVE IP".4500: UDP, length 530
10:37:44.649477 IP 10.0.0.138.56029 > "SLAVE IP".4500: UDP, length 208
10:37:44.662920 IP "SLAVE IP".4500 > 10.0.0.138.56029: UDP, length 80
10:37:44.731249 IP 10.0.0.138 > 10.0.0.1: ICMP echo request, id 3032, seq 0, length 64
10:37:44.731312 IP 10.0.0.1 > 10.0.0.138: ICMP echo reply, id 3032, seq 0, length 64
10:37:45.727136 IP 10.0.0.138 > 10.0.0.1: ICMP echo request, id 3032, seq 1, length 64
10:37:45.727162 IP 10.0.0.1 > 10.0.0.138: ICMP echo reply, id 3032, seq 1, length 64
10:37:46.028464 IP 10.0.0.138.56031 > "MASTER IP".4500: UDP, length 423
10:37:51.033765 IP 10.0.0.138.56031 > "MASTER IP".4500: UDP, length 423
10:37:56.036321 IP 10.0.0.138.56031 > "MASTER IP".4500: UDP, length 423
10:38:01.039745 IP 10.0.0.138.56031 > "MASTER IP".4500: UDP, length 423
10:39:59.622973 IP 10.0.0.1 > 10.0.0.138: ICMP echo request, id 12343, seq 0, length 28
10:40:00.645893 IP 10.0.0.1.67 > 10.0.0.138.68: UDP, length 300
10:40:00.654957 IP 10.0.0.1.67 > 10.0.0.138.68: UDP, length 300