Billion Electric Company BiGuard 50G - Manual (Page 91)

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4.4.1.5 LAN Address Mapping
LAN Address Mapping is a function that can support multiple subnet and also
multiple NAT, you can specify a subnet and LAN Gateway IP Address and select
associated WAN IP Address specified in WAN IP Alias in Configuration -> WAN ->
WAN IP Alias.
Please click Create to create a LAN Address Mapping rule.
Name: Please input the name of the rule.
IP Address: Please input the LAN Gateway IP Address you would like to use.
Netmask: Please input the Netmask you would like to use.
WAN IP Address: Please click Candidates to select the WAN IP address you would
like to use from WAN Alias list.
Click the Apply button to add the configuration into the LAN Address Mapping.