I had hopes, that "full transparent proxy" option will be can use Additional IP WAN address when for example:
Interface LAN: 192.168.0.0/24
Interface LAN2: 192.168.1.0/24
Interface WAN: 88.***.***.***/30
Additional WAN IP: 82.***.***.1/24 (I have class C IP addresses from my ISP)
Additional WAN IP: 82.***.***.2/24
SNAT Definition
192.168.0.0/24 --> Any --> Any SNAT 82.***.***.1
192.168.1.0/24 --> Any --> Any SNAT 82.***.***.2
Now Proxy use only main IP address on interface which have active default gateway.
If it can make it by Astaro will be great.