DHCP on 'hybrid' network - how to point clients to specific DHCP server

Moving computers off of a private 'hybrid' network to a different private network.
ISSUE: The clents will boot and ask for an IP from DHCP, problem is the 'hybrid' network runs a DHCP server with address range of 192.99.x.x whereas the DHCP server we need to hit is on the 10.2.xx address range. Is there a simple method to point
clients to a specific DHCP server?
Note: I have requested Network Srvcs to block UDP traffice on ports 67 and 68 for the address range of the 'hybrid' network.
Users still need access to the hybrid.
Please advise,
Many Thanks in advance

DHCP is rather a simple minded service. The client broadcasts out and the first guy responds. If you ahve two DHCP servers on the same subnet or wire, even if they have different IP addresses on that subnet, and they both have scopes corresponding to
the IP address of their interface on that subnet/wire, then they will offer DHCP services. DHCP won't give out an IP on an interface that the scope doesn't match the subnet.
For example, if I have a DHCP server with an IP of 10.200.1.200/24, and a scope of 10.200.1.100-150/24, then it will give out IPs on that interface. However, if that same DHCP server has an interface configured with 192.168.20.150, then DHCP will not give
out IPs on an interface configured with 10.200.1.100, unless there is a Relay Agent or IP Helper from the router or switch VLAN that is connected to that subnet. You can test this out yourself.
A separate VLAN for each subnet solves the problem because you are separating the two servers to hostg DHCP on their own, respective subnets.
Ace Fekay
MVP, MCT, MCSE 2012, MCITP EA & MCTS Windows 2008/R2, Exchange 2013, 2010 EA & 2007, MCSE & MCSA 2003/2000, MCSA Messaging 2003
Microsoft Certified Trainer
Microsoft MVP - Directory Services
Complete List of Technical Blogs: http://www.delawarecountycomputerconsulting.com/technicalblogs.php
This posting is provided AS-IS with no warranties or guarantees and confers no rights.

Similar Messages

RMI How can a Client reconnect to a server after connection(any)-error

I have the following problem:
My RMI-Server runs for ever. In a batch-queue I have a procedure which looks periodly wether rmiregistry
and RMI-Server exists. On error both processes are killed and restarted.
My client as a simple example is displaying the server time. If any communication-problem with the
server exists, I need an automatic reconnect to the server. I accept that into the time distanz of the
error the display is frozen. Its unacceptable to restart the client !!.
The following example demonstates my test-example:
Server:
1. Start
2. waits for connecting (factory)
3. answer time-requests
Client:
1. Start
2. create a time class initially 1.jan.1970 00:00:00
3. Start a timer displaying the time class every second
4. start a timer connecting/reconnecting to the server and ask the servers actual time every second
PS. Is the server to stubil programmed, so that a hang can exists?
It would be nice, if anybody could answer me !!
The following sources work correctly without solving the problem of the reconnect:
////////////// Echo.java
package emi.server;
import java.rmi.*;
import java.util.*;
public interface Echo
extends Remote
public Date getTime() throws RemoteException;
////////////// EchoClient.java
package emi.server;
//import emi.utility.basics.*;
public class EchoClient
public static void main(String args[]) throws Exception
EchoClient echoclient1 = new EchoClient();
//Check the argument count
if (args.length != 1)
System.err.println("Usage: EchoClient <server> --> EXIT");
System.exit(0);
// all of time relevant things
Etim acttim = new Etim();
// displaying continous the time
EchoClientDisplay disp = new EchoClientDisplay(acttim);
disp.StartTimer();
// transfering continous the time from the server
EchoClientTransfer trans = new EchoClientTransfer(acttim, args[0]);
trans.StartTimer();
////////////// EchoClientDisplay.java
package emi.server;
import java.awt.event.*;
import javax.swing.*;
// displaying every 750 Milliseconds the value of the time
public class EchoClientDisplay implements ActionListener
private Timer tim;
private Etim tact;
public EchoClientDisplay(Etim tact)
tim = new Timer(750, this);
this.tact = tact;
public void StartTimer()
tim.setRepeats(true);
tim.setInitialDelay(5);
tim.start();
public void actionPerformed(ActionEvent e )
System.out.println(tact.toString());
////////////// EchoClientTransfer.java
package emi.server;
import java.rmi.Naming;
import java.rmi.RMISecurityManager;
import java.awt.event.*;
import javax.swing.Timer;
import java.util.Date;
// transferring the actual time from the server
public class EchoClientTransfer implements ActionListener
private Etim tact;
private String hostname;
private Timer tim;
private boolean init = false;
private Echo echoRef1 = null;
public EchoClientTransfer(Etim tact, String hostname)
this.tact = tact;
this.hostname = hostname;
this.tim = new Timer(500, this);
public void StartTimer()
tim.setRepeats(true);
tim.setInitialDelay(5);
tim.start();
public void actionPerformed(ActionEvent e )
//>>>>>>>>>>> this construction doesnt work correctly, its only good until the first
// network error
try
if( init == false )
// Create and install the security manager
System.setSecurityManager(new RMISecurityManager());
//get the remote factory object from the registry
String url = new String("rmi://"+ hostname +"/EchoFactory");
EchoFactory remoteFactory = (EchoFactory)Naming.lookup(url);
//get references to new EchoImpl instances
echoRef1 = remoteFactory.getEcho("User Meyer");
init = true;
if( init = true )
//make the remote calls
Date d = echoRef1.getTime();
tact.setDate(d);
catch(Exception ee)
System.out.println(ee.toString());
init = false;
//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
////////////// EchoFactory.java
package emi.server;
import java.rmi.RemoteException;
import java.rmi.Remote;
public interface EchoFactory extends Remote
Echo getEcho(String userName) throws RemoteException;
////////////// EchoFactoryImpl.java
package emi.server;
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
public class EchoFactoryImpl extends UnicastRemoteObject implements EchoFactory
EchoFactoryImpl() throws RemoteException {};
public Echo getEcho(String userName) throws RemoteException
EchoImpl echoRef = new EchoImpl(userName);
return (Echo)echoRef;
////////////// EchoImpl.java
package emi.server;
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
import java.util.*;
public class EchoImpl extends UnicastRemoteObject implements Echo
private String userName;
public EchoImpl() throws RemoteException
public EchoImpl(String userName) throws RemoteException
this.userName = userName;
public Date getTime()
Etim e = new Etim();
e.setTimeAct();
return e.get();
////////////// EchoServer.java
package emi.server;
import java.rmi.Naming;
import java.rmi.RMISecurityManager;
public class EchoServer
public static void main(String args[]) throws Exception
// Create and install the security manager
System.setSecurityManager(new RMISecurityManager());
// Create the servant instance for registration
EchoFactory factoryRef = new EchoFactoryImpl();
// Bind the object to the rmiregistry
Naming.rebind("EchoFactory", factoryRef);
System.out.println("Echo object ready and bound to the name 'EchoFactory'!");
////////////// Etim.java
package emi.server;
import java.util.*;
import java.text.*;
// this is my central class working up all time problems .. many hundred lines of code
// I think, you must not look at this code ist setting and reading time
// this is only a subset of methods for this example
public class Etim
private Date dat;
private Calendar cal;
public Etim()
cal = Calendar.getInstance(); // Gregorianischer Kalender
dat = new Date(0L); // January 1, 1970, 00:00:00
cal.clear();
* Zeit lesen.
public Date get()
return dat;
// setting the time
public void setDate( Date d )
dat.setTime( d.getTime() );
cal.setTime(dat);
// gets my time-class to the current system-clock
public void setTimeAct()
long millis;
millis = System.currentTimeMillis();
setMilli(millis);
* Zeit setzen.
public void setMilli(long millis)
dat.setTime(millis);
cal.setTime(dat);
// time in german format: day.month.year hour:minute:second:millisecond
public String toString()
return toStringTagMoJahr() + " " + toStringStdMiSek() +
":" + cal.get(Calendar.MILLISECOND);
* Ausgabeformat Tag.Monat.Jahr (z.B. 01.01.2001).
public String toStringTagMoJahr()
SimpleDateFormat s = new SimpleDateFormat("dd.MM.yyyy");
return s.format(dat);
* Ausgabeformat Stunde:Minute:Sekunde (00:00:00 - 23:59:59).
public String toStringStdMiSek()
SimpleDateFormat s = new SimpleDateFormat("HH:mm:ss");
return s.format(dat);

Hello willy51,
Thank you for answering.
I think, your comment of the design is true - its a problem when starting up in a new enviroment and
you have nobody who shows you the right direction at the beginning. Talking personally together only
10 minutes is better than writing a noval.
I thing the following model of a client works better:
concept:
- visualize a personal time class continously evgery second
- if there is a connection to a server set the time-class with the server time
- if you loss connection, try to reconnect
question:
in which situation hangs connectToServer() ?
(whithout the simple errors : no rmiregistry, no rmi-server)
public class EchoClient
private String hostname;
public static void main(String args[]) throws Exception
// my internal TIME-Class
Etim acttim = new Etim();
// Create and install the security manager
System.setSecurityManager(new RMISecurityManager());
// remote call
Echo echoRef1 = null;
String url = new String("rmi://"+ servername:port +"/EchoFactory");
// displaying continous the time, technic = swing.timer
EchoClientDisplay disp = new EchoClientDisplay(acttim);
disp.StartTimer();
// transfering continous the time from the server, technic = swing.timer
// The state of transfer from server = offline
EchoClientTransfer trans = new EchoClientTransfer(acttim);
trans.StartTimer();
// Connect to server
connectToServer(url, echoRef1, trans);
// wait for ever, if connection failed, try every 5 seconds a reconnect to server
while(true)
// test, if connection failed. The connections fails if the Object EchoClientTransfer
// get a error, when it asks the server for the time ( remote call )
if(trans.getStatus() == false ) // test, if connection failed
connectToServer(url, echoRef1, trans);
// try it again after 5 seconds
Thread.sleep(5000);
private static void connectToServer(String url, Echo echoRef1, EchoClientTransfer trans)
System.out.println("Retry connection");
// Connect to server
while( true )
try
//get the remote factory object from the registry
EchoFactory remoteFactory = (EchoFactory)Naming.lookup(url);
//get references to new EchoImpl instances
echoRef1 = remoteFactory.getEcho("User Meyer");
// reactivate Datatransfer because I have now a new connection to the server
trans.reactivateAfterConnectionError(echoRef1);
// end of initialisation
break;
catch( Exception e )
//>>>>>>> Error initialising connection to server. try again after 5 seconds"
Thread.sleep(5000); // retry after 5 seconds

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This question was solved.
View Solution.

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Reminder: Please select the "Accept as Solution" button on the post that best answers your question. Also, you may select the "Kudos" button on any helpful post to give that person a quick thanks.

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Steven Lee Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

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Tony

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Oracle XE is a subset of SE, you can expect this to work almost like this, considering its limitation and capabilities. You can connect whatever you want against an XE, that's what the listener is for. You only need to configure your tnsnames to properly point to your XE database. In case you don't have a tnsnames.ora file, or don't want to configure one, you can choose to access your database by means of the EZConnect:
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~ Madrid

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hi,
this is yasmin riaz..i have installed oracle 8.1.5 enterprise edition on my server and then install oracle 8.1.5 cleint on another pc and then i get connected from client to that server db by net8 asistant on client machine..this setup is working fine at my office means connecting to server via client in local area net work..
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its urgent
thanx in advance
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while you are connected to the same domain as of oracle server then this is no problem.
varify your domain connection by pinging
the oracle server machine at your office,
ask your network administrator to allow you
enough priveleges and network infrastructure
so that you could see oracle server in
your network neighborhood.
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now try the connection
if the entry of oracle server exists
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replace the name of oracle server machine
with tcp/ip address of oracle server in
tnsnames.ora

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no ip route-cache
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lease 1
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Steve

Clients Not seeing DHCP server at branch office or not accepting ip offers (NO LOG REPORTS KIND OF IN THE DARK)

Hi there i am having an issue that has popped up recently i have a DC at a branch office that is connected to the main office DC via a Persistent Demand Dial connection in RRAS. Everything was working properly according to me until i found out that the Network
Admin who manages the branch office network failed to notify me that client machines weren't getting IP addresses from the DHCP server. This server was recently installed and wasn't fully implemented till about a week ago when i configured the Demand Dial
connection in RRAS up until that point it just had a regular old VPN connection to the main office while we worked out the kinks with a few things. the things ive tried so far to get DHCP working are as followed
1.Rebooted the branch office server (MULTIPLE TIMES)
2. Uninstalled the DHCP Role and re-installed it....To my surprise 1 client managed to get a ip on its lan adapter after DHCP was re-installed but nothing else
3. Disconnected the connection between the main office DC and the Branch office DC as i figured the main office DC DHCP server might be interfering with the branch office DC DHCP Server but nothing happened
4. Unauthorized and Reauthorized the main office DHCP server and the branch office DHCP server nothing changed
5. sifted through multiple log files on both servers and found noting in fact DHCP logs are empty on both servers
6. restored backups of the DHCP servers from when they were working
7. came here cause im out of ideas and im pulling my hair out
here are the current statistics from the problem server
Start Time: 7/12/2014 2:02:10PM
Up Time: 1Hours, 18 Minutes, 41 Seconds
Discovers: 90
Offers: 90
Requests: 2
Acks: 13
Nacks: 0
Declines: 0
Releases: 0
Total Scopes: 1
Total Addresses 253
In Use 2 (0%)
Available: 251 (99%)
Id like to add that RRAS was getting IP addresses from the problem server up until the point i uninstalled the role and re-installed it
heres is a ipconfig /all from the problem server
Windows IP Configuration
Host Name . . . . . . . . . . . . : MNB-DC
Primary Dns Suffix . . . . . . . : VTEACR.LOCAL
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : Yes
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : VTEACR.LOCAL
PPP adapter Remote Router:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Remote Router
Physical Address. . . . . . . . . :
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 10.141.70.25(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : 10.141.70.10
NetBIOS over Tcpip. . . . . . . . : Disabled
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Broadcom NetXtreme Gigabit Ethernet
Physical Address. . . . . . . . . : 00-16-35-AB-D3-05
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::d9e:daa4:34dd:db44%10(Preferred)
IPv4 Address. . . . . . . . . . . : 10.141.80.102(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : fe80::226:5aff:feb7:5b3c%10
10.141.80.1
DNS Servers . . . . . . . . . . . : ::1
10.141.80.102
NetBIOS over Tcpip. . . . . . . . : Enabled
PPP adapter RAS (Dial In) Interface:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : RAS (Dial In) Interface
Physical Address. . . . . . . . . :
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 169.254.238.243(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Disabled
Tunnel adapter Local Area Connection* 8:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : isatap.{427DF66B-3B30-40B1-B67E-B5587465C
394}
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 9:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 02-00-54-55-4E-01
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 11:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : isatap.ziricom.com
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 12:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : isatap.VTEACR.LOCAL
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 13:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : isatap.{BE201060-A9B9-404A-8361-F8FFB82F5
6F6}
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 14:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #5
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 15:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : isatap.VTEACR.LOCAL
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 16:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #7
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 19:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : isatap.ziricom.com
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
if anymore information is needed please let me know i have full access to everything on the network so its not a problem and i am able to remotely access the branch office DC and all computer and switches at any time of the day
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Hi,
Does this issue occur on one client or multiple?
Please check this article:
http://technet.microsoft.com/en-us/library/cc757164(v=ws.10).aspx#BKMK_5
Regards.
Vivian Wang

DHCP on 'hybrid' network - how to point clients to specific DHCP server

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