The incoming traffic can be from any vlan. The selected traffic will be based on source IP address. How to configure that using irule? Default gateway has 2 members A & B
1)Source IP 10.7.3.1(private IP) will be SNAT to 202.44.44.77(public IP) & will be using gateway 202.55.55.66.
2)Source IP 10.7.4.0(Private IP) will be using the interface C pointing to gateway pool C=202.55.55.66. In this case, it will use the self-IP (public IP) configured in interface C.
3)same as 2) but when gateway pool C is down, it will use the default gateway(which is load-balancing btw link to A & B).