Outbound NAT doesn't work

[mybox65]

Topology：


It sounds the "Outbound NAT" did not convert the LAN subnet(100.98.48.0/24) to its WAN interface address(192.168.103.2).



I'm at host 100.98.48.63, trying to ping 192.168.103.1. At the same time capturing these ICMP packets in OPNsense, by using pftop -f 'net 100.98.48.0/24 and proto icmp'(see the snapshot below), I can see the outbound ICMP packets, all from 100.98.48.63 to 192.168.103.1 instead of my expectation to be converted to interface address(192.168.103.2).




There are no any firewall Rule on LAN port inbound direction


My next step is to going to change the NAT Address: interface address to WAN address, but I think both of them have the same IP address 192.168.103.2.  Any ideas are very appreciated !!