/// <summary>
/// Subnet a network into multiple nets of cidr mask
/// Subnet 192.168.0.0/24 into cidr 25 gives 192.168.0.0/25, 192.168.0.128/25
/// Subnet 10.0.0.0/8 into cidr 9 gives 10.0.0.0/9, 10.128.0.0/9
/// </summary>
public static bool TrySubnet(IPNetwork network, byte cidr, out IPNetworkCollection ipnetworkCollection)
{
IPNetworkCollection inc;
InternalSubnet(true, network, cidr, out inc);
if (inc == null)
{
ipnetworkCollection = null;
return(false);
}
ipnetworkCollection = inc;
return(true);
}
private static void InternalSubnet(bool trySubnet, IPNetwork network, byte cidr,
out IPNetworkCollection ipnetworkCollection)
{
if (network == null)
{
if (trySubnet == false)
{
throw new ArgumentNullException("network");
}
ipnetworkCollection = null;
return;
}
if (cidr > 32)
{
if (trySubnet == false)
{
throw new ArgumentOutOfRangeException("cidr");
}
ipnetworkCollection = null;
return;
}
if (cidr < network.Cidr)
{
if (trySubnet == false)
{
throw new ArgumentException("cidr");
}
ipnetworkCollection = null;
return;
}
ipnetworkCollection = new IPNetworkCollection(network, cidr);
return;
}
