Missing the gateway on opt interface so that cannot add it to LB pool

[burk]

I try to add Load Balance pool but found the problem the opt interface not appear in dropdown box and when I show the interface status , I found that not has the gateway IP. What can I do continue to configure LB pool and opt interface? ( I already enable both WAN and opt interface with static IP and gateway)

[sullrich]

Gateway needs to be in the same subnet.