How to do mapping when multiple servers exist?

If DSS has multiple servers in the LAN mapped to the same WAN IP, generally, one principle is followed: In the same service, LAN IPs are different but the port is the same; the WAN IP is the same but ports are different. For example, for MTS, the 9100 port of the first IP 192.168.1.110 is mapped to the WAN 9100, and the 9100 port of the second DSS192.168.1.111 is simply mapped to 9101.

Thereby, 9100 ports of different LAN IPs are mapped to 9100, 9101, 9102 and so on of the same WAN IP.