Proxy-ARP Settings

Hi,

we have a problem setting up our ASG 320 HA. We try to set up the Proxy-ARP for the ethernet standard interface (Interfaces & Routing). We need to configure 4 WAN Adresses to use with the proxy-ARP.

Our actual firewall uses 4 WAN Adresses, that looks like this:
proxy-arp
<wan ip-adress 1>/32
<wan ip-adress 2>/32
<wan ip-adress 3>/32
<wan ip-adress 4>/32

But in the ASG it seems that it's only possible to set an IP-range, such as <wan ip-adress>/29.

Is there any possibility to enter the different WAN adresses?

Thanks for your help.