How do I reach the modem settings page from inside firewall (load balancing 2 wan)

Question

Here's what I did to achieve the desired result:

On the IP's modem 1: 192.168.1.1 Modem 2: 192.168.2.1 On pfSense: 192.168.3.1

I assigned 2 new OTP interfaces on the same physical network card used on WAN 1 & 2 Enable this interface and give it an IP address on the same subnet (ie, 192.168.1.2 & 192.168.2.2) Create a new NAT outbound rule associated with this interface, with source 192.168.3.0/24 and destination 192.168.1.0/24 Create a new NAT outbound rule associated with this interface, with source 192.168.3.0/24 and destination 192.168.2.0/24

Now I can access the modem interface on modem 1 & 2. Problem appears when I config load balance multiwan. At Firewall / Rules / LAN: if I choose Default gateway: Default. I can access modem 1 & 2. if I choose Default gateway: MultiWAN. I can't access modem 1 & 2. enter image description here

Please help me fix it. And I have other question: How can I use 1 WAN nic for multi pppoe account on pfsense? Example: I have 2 pppoe account from same ISP but I want to use only wan nic on pfsense.