What I understood till now , - if you're in primary node you can ping ( primary node self ip and floating ip ) that's make sense because it's owned by primary one.
- you can't ping the peer self ip ( 188.8.131.52 ).
- I think the linked article will not help you in this case
I want to know The below results when tring to ping both of devices ? as I see in this one " 12:14:59.719138 ARP, Request who-has 184.108.40.206 tell 220.127.116.11, length 48 out slot1/tmm2 lis= " you are directed to ask the gateway.
- Could you please to check the assigned Vlan ( 2 local self ips and floating one ) make sure they are a in the same correct Vlan.
- I see you connects both of f5 devices by a L3 switch , so can you try to ping the Big-ips gateway ( Switch interface ip ) which connects with both of Big-ip devices in this subnet ( 172.166.94.x ).
- If I miss some points please explain to me your network connectivity ( Vlans and a simple design ) to see which devices interacts with Bigip.
- Try to ping ( the Local self IP and Floating one )of the Peer device from Peer device itself.
on brief , I want you to give up using dynamic arp to map IP & MAC , and using a static entry instead to define your issue is related to big ip interfaces , of one of your nodes can't resolve arp requests.