BR-RTR
chain PREROUTING {
      type nat hook prerouting priority filter;
      ip daddr 172.16.40.2 tcp dport 8080 dnat ip to 192.168.50.2:8080
      ip daddr 172.16.40.2 tcp dport 2026 dnat ip to 192.168.50.2:2026
      }

HQ-RTR
chain PREROUTING {
      type nat hook prerouting priority filter;
      ip daddr 172.16.30.2 tcp dport 8080 dnat ip to 192.168.100.2:80
      ip daddr 172.16.30.2 tcp dport 2026 dnat ip to 192.168.100.2:2026
      }