MicroNet Technology SP5001/S - Manual (Page 22)

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3.4 IP Sharing Configuration
One Sets SP5001/S
The function is for user whose network environment is behind IP Sharing device. It is
said SP5001/S is connected to the IP Sharing device (Router).
An example such ADSL network is like the following.
The WAN IP Address obtained from ADSL has two kinds of methods. One is fixed IP
Address, while user applies for one or more fixed IP Addresses. Another is dynamic IP
Address while user applies for dial-up connection way.
The LAN IP Address of User’s PC can be set as DHCP client in order to gain a valid
one. One can also assign a fixed IP address, which belongs to the same network
segment as the LAN interface of IP Shari ng device.
SP5001/S must enable the IP Sharing function for the fixed / dynamic WAN IP
Address.
Fixed IP Address – usr/config$ ifaddr –ipsharing 1 210.11.22.33
Note: With Dynamic WAN IP Address, when the WAN IP is changed, we need to change
the external IP of SP5001/S using above command.
IP Sharing device must have a function to do IP/Port mapping. Some is named as
DMZ, some is named as virtual server whatever. The VoIP message from WAN has to
completely pass forward to the LAN. It is said if SP5001/S is assigned a virtual fixed IP
Address such as 192.168.1.5, IP Sharing device must forward the VoIP message to
192.168.1.5.