One or more IP addresses with subnet masks that will be used as the virtual IP addresses (VIPs) for load balancing on the ...

One or more IP addresses with subnet masks that will be used as the virtual IP addresses (VIPs) for load balancing on the external network adapter. Should include the IPsec tunnel endpoint IP addresses on the external adapter.  

Specify the IPv4 address and subnet in the format IP_ADDR/SUBNET. For IPv6 specify the prefix length along with the IP address. If ISATAP is deployed in the internal network then at least one of the IP addresses specified in the parameter should be present in the ISATAP name entry in DNS. If the external adapter virtual IP addresses are not specified then by default the IPsec tunnel endpoint IP addresses on the external adapter are used.