I have a small public IP block. SG-5100 responds on the primary IP assigned to the WAN interface but not those configured to Proxy ARP. I tried "network" and "host", neither works.
@peterlecki What are you trying to do? If you want pfSense to handle them for purposes of NATing to an internal server for example, you would use an IP alias VIP.
Virtual IP Addresses
Thanks for your help, my understanding was incorrect. I got it now.