NetworkSettings

public sealed class NetworkSettings
{
    public NetworkSettings(string name);

    public string Name { get; set; }
    public NetworkFlags Flags { get; set; }
    public HostName Subnet { get; set; }
    public byte SubnetPrefixLength { get; set; }
    public HostName Gateway { get; set; }
}

NetworkFlags.EnableIPv4, NetworkFlags.EnableIPv6 and NetworkFlags.Internal are accepted. IPv4 is always enabled. To enable IPv6, set both NetworkFlags.EnableIPv4 and NetworkFlags.EnableIPv6; IPv6-only networks (EnableIPv6 without EnableIPv4) are not supported and fail with E_NOTIMPL. Subnet and SubnetPrefixLength must be set together, Gateway must use the same address family as Subnet, and an IPv6 subnet requires EnableIPv6. When Subnet is null, the session chooses an IPv4 subnet; it has no default IPv6 subnets, so set an IPv6 subnet when IPv6 is enabled.

Example:

var settings = new NetworkSettings("backend")
{
    Flags = NetworkFlags.Internal,
    Subnet = new HostName("10.10.0.0"),
    SubnetPrefixLength = 24,
    Gateway = new HostName("10.10.0.1"),
};