Specifying this parameter indicates that static pool IPv4 addressing should be enabled. The parameter contains an IP address ...

Specifying this parameter indicates that static pool IPv4 addressing should be enabled. The parameter contains an IP address range (consisting of a start IP and an end IP) from which IP addresses are allocated to VPN clients. 
In load balancing scenario only static pool IPv4 addressing is supported for VPN (DHCP address assignment is not supported). Hence it is mandatory to specify this parameter and an IPv4 address range should be provided for every node in the cluster. The address are specified in the following format: StartIPRange1, EndIPRange1, StartIPRange2, EndIPRange2, StartIPRange3, EndIPRange3. Essentially the start and end IP addresses of each of the ranges are specified one after the other and separated by commas.