Public Subnet Sharing

[leoiaco]

Hi all,

I've two fortigate VM with WAN configured like show below:

FORTIGATE1- > interface WAN1  -> x.x.x.132 (ISP subnet /28)

FORTIGATE2- > interface WAN1  -> x.x.x.133 (same above ISP subnet /28)

VM shares the same public subnet, VM are connected to the same virtual switch, and on these 2 wan are connected 2 (WAN FGT1) + 2 (WAN FGT2) web servers with load balancing.

Randomly happens that servers behind WAN1(FGT1) or WAN1(FGT2) goes offline (servers are on but became unreacheable from outside) and the only way to gets back online the servers is to "stop and start" real servers node from load balance monitor.

Furthermore, I've noticed that the only way to permit to work well the two fortigate VM is to disable "ARP Reply" on one of two FGT VM (if I enable ARP Reply on both nothing work).

Can you help me to understand if something is wrong configured?

Thanks in advance.

Regards

Leo