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);
}
protected void fillIPCalc()
{
if (ip == null || ip.getIp() == null)
{
return;
}
this.fill = true;
this.fillComboBox_Prefix();
this.fillComboBox_NetworkMask();
// Prefix
int prefix = ip.getNetworkPrefix();
if (prefix >= 8 && prefix <= 30)
{
if (prefix != ip.getNetworkClassPrefix() && !ip.isFirstSubNetBit())
{
prefix--;
}
prefix = prefix - ip.getNetworkClassPrefix();
}
else
{
prefix = -1;
}
prefixComboBox.SelectedIndex = prefix;
// NetMask
netMaskComboBox.SelectedIndex = prefix;
// folgendes nur wenn Netzwerkmaske vorhanden
// nicht der Fall bei Class-D oder E
if (prefix != -1)
{
// max Net Hosts
maxCountHosts.Text = ip.getMaxNetworkHosts() + "";
// Net Class
calcNetwork.Text = ip.getNetworkClassName();
// Broadcast
calcBroadcast.Text = ip.getBroadCast();
// Network
calcNetwork.Text = ip.getNetwork();
// Net-Class
netClassComboBox.SelectedIndex = ip.getNetworkClass();
// IP-Range
string [] ipRange = ip.getNetworkIPRange();
calcIPRange.Text = ipRange[0] + " - " + ipRange[1];
// max Sub-Nets
clacMaxNetCount.Text = ip.getMaxSubNets() + "";
}
else // Anzeige löschen
{
// max Net Hosts
maxCountHosts.Text = "";
// Net Class
calcNetwork.Text = "";
// Broadcast
calcBroadcast.Text = "";
// Network
calcNetwork.Text = "";
// IP-Range
calcIPRange.Text = "";
// max Sub-Nets
clacMaxNetCount.Text = "";
}
// Description
string desc = "";
if (ip.get1Byte() >= (byte)64 && ip.getNetworkClass() == (byte)0) // 64.
{
desc = "reserved for future use";
}
if (ip.get1Byte() == (byte)127) // localhost
{
desc = "localhost and loopback-Device - your one computer";
}
if (ip.get1Byte() == (byte)10) // private 10.0.0.0
{
desc = "private net - for internal use only, would not be routed in internet";
}
if (ip.get1Byte() == (byte)192 && ip.get2Byte() == (byte)168) // private 192. - 168.
{
desc = "private net - for internal use only, would not be routed in internet";
}
if (ip.get1Byte() == (byte)172 && (ip.get2Byte() >= (byte)16 && ip.get2Byte() <= (byte)31)) //private 172.16 - 172.31
{
desc = "private net - for internal use only, would not be routed in internet";
}
if ((ip.get1Byte() == (byte)169) && (ip.get2Byte() == (byte)254)) // 169.254.
{
desc = "APIPA Automatic Private IP Addressing";
}
if (ip.get1Byte() == (byte)0) // 0.
{
desc = "0.0.0.0 = default route";
}
if (ip.getNetworkClass() == (byte)4) // Class-E
{
desc = "reserved for future use";
}
if (ip.getNetworkClass() == (byte)3) // Class-D
{
desc = "used for multicast";
}
noticeLabel.Text = "Info stuff: " + desc;
this.fill = false;
}