public IPTool getNextSubNet(long numberOfHosts)
{
IPTool ip = IPTool.getNextIP(this.getBroadCast());
ip.setIp(this.long2String(ip.ip2Long() + (long)1));
ip.setFirstSubNetBit(this.isFirstSubNetBit());
int lastPrefix = ip.getNetworkClassPrefix();
int prefix = 30;
do
{
if (prefix < ip.getNetworkClassPrefix())
{
return(null); // no subnet found
}
ip.setNetworkPrefix(prefix);
prefix--;
// ignore subnetbit?
if (!ip.isFirstSubNetBit() && prefix == lastPrefix + 1)
{
prefix--;
}
}while (ip.getMaxNetworkHosts() < numberOfHosts);
return(ip);
}
private void prefixComboBox_SelectedIndexChanged(object sender, System.EventArgs e)
{
if (ip == null || ip.getIp() == null || fill)
{
return;
}
if (ip.getNetworkClassPrefix() == -1)
{
return;
}
int prefix = Int32.Parse((string)prefixComboBox.SelectedItem);
ip.setNetworkPrefix(prefix);
fillIPCalc();
}