diff --git a/src/main/java/org/jvnet/hudson/plugins/port_allocator/Pool.java b/src/main/java/org/jvnet/hudson/plugins/port_allocator/Pool.java
index 4d04539..14f4a32 100644
--- a/src/main/java/org/jvnet/hudson/plugins/port_allocator/Pool.java
+++ b/src/main/java/org/jvnet/hudson/plugins/port_allocator/Pool.java
@@ -6,20 +6,21 @@
  * @author pepov
  */
 public class Pool {
-    
-    public String name;
-    public String ports;
 
-    public int[] getPortsAsInt() {
+	public boolean global;
+	public String name;
+	public String ports;
 
-        String[] portsItemsAsString = ports.split(",");
+	public int[] getPortsAsInt() {
 
-        int[] portsItems = new int[portsItemsAsString.length];
+		String[] portsItemsAsString = ports.split(",");
 
-        for (int i = 0; i < portsItemsAsString.length; i++) {
-            portsItems[i] = Integer.parseInt(portsItemsAsString[i]);
-        }
+		int[] portsItems = new int[portsItemsAsString.length];
 
-        return portsItems;
-    }
+		for (int i = 0; i < portsItemsAsString.length; i++) {
+			portsItems[i] = Integer.parseInt(portsItemsAsString[i]);
+		}
+
+		return portsItems;
+	}
 }
diff --git a/src/main/java/org/jvnet/hudson/plugins/port_allocator/PortAllocator.java b/src/main/java/org/jvnet/hudson/plugins/port_allocator/PortAllocator.java
index ccdb062..75e05de 100644
--- a/src/main/java/org/jvnet/hudson/plugins/port_allocator/PortAllocator.java
+++ b/src/main/java/org/jvnet/hudson/plugins/port_allocator/PortAllocator.java
@@ -4,11 +4,28 @@
 import hudson.Extension;
 import hudson.FilePath;
 import hudson.Launcher;
-import hudson.model.*;
+import hudson.model.BuildListener;
+import hudson.model.AbstractBuild;
+import hudson.model.Computer;
+import hudson.model.Descriptor;
+import hudson.model.Executor;
 import hudson.tasks.BuildWrapper;
 import jenkins.tasks.SimpleBuildWrapper;
 import hudson.util.FormValidation;
+
+import java.io.IOException;
+import java.io.PrintStream;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.regex.Pattern;
+
+import jenkins.model.Jenkins;
+import jenkins.model.Jenkins.MasterComputer;
 import net.sf.json.JSONObject;
+
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.jenkinsci.Symbol;
@@ -19,11 +36,6 @@
 
 import com.google.common.collect.Lists;
 
-import java.io.IOException;
-import java.io.PrintStream;
-import java.util.*;
-import java.util.regex.Pattern;
-
 /**
  * Allocates TCP Ports on a Computer for consumption and sets it as
  * environment variables, see configuration
@@ -54,7 +66,7 @@ private PortAllocator(PortType[] ports) {
 
 	@DataBoundConstructor
 	public PortAllocator() {
-	// empty 
+	// empty
 	}
 
 	@DataBoundSetter
@@ -102,6 +114,7 @@ public String[] getPlainports() {
     public void setUp(Context context, Run<?, ?> run, FilePath workspace, Launcher launcher, TaskListener taskListener, EnvVars envVars) throws IOException, InterruptedException {
         PrintStream logger = taskListener.getLogger();
 
+        Computer master = Jenkins.getInstance().toComputer();
         Computer cur = workspace.toComputer();
         Map<String,Integer> prefPortMap = new HashMap<String,Integer>();
 	Run<?, ?> prevBuild  = run.getPreviousBuild();
@@ -112,14 +125,22 @@ public void setUp(Context context, Run<?, ?> run, FilePath workspace, Launcher l
                 prefPortMap = prevAlloc.getPreviousAllocatedPorts();
             }
         }
+        final PortAllocationManager mpam = PortAllocationManager.getManager(master);
         final PortAllocationManager pam = PortAllocationManager.getManager(cur);
         Map<String,Integer> portMap = new HashMap<String,Integer>();
         final List<Port> allocated = new ArrayList<Port>();
 
         for (PortType pt : ports) {
-            logger.println("Allocating TCP port "+pt.name);
+        	boolean global = false;
+        	try {
+				Pool pool = PortAllocator.DESCRIPTOR.getPoolByName(pt.name);
+				global = pool.global;
+			} catch (PoolNotDefinedException e) {
+				// ignore, global = false
+			}
+            logger.println("Allocating TCP port "+pt.name + (global ? " (global)" : ""));
             int prefPort = prefPortMap.get(pt.name)== null?0:prefPortMap.get(pt.name);
-            Port p = pt.allocate(run, pam, prefPort, launcher, taskListener);
+            Port p = pt.allocate(run, global ? mpam : pam, prefPort, launcher, taskListener);
             allocated.add(p);
             portMap.put(pt.name, p.get());
             logger.println("  -> Assigned "+p.get());
diff --git a/src/main/resources/org/jvnet/hudson/plugins/port_allocator/PortAllocator/global.jelly b/src/main/resources/org/jvnet/hudson/plugins/port_allocator/PortAllocator/global.jelly
index dd12560..d5796a1 100644
--- a/src/main/resources/org/jvnet/hudson/plugins/port_allocator/PortAllocator/global.jelly
+++ b/src/main/resources/org/jvnet/hudson/plugins/port_allocator/PortAllocator/global.jelly
@@ -9,6 +9,9 @@
         <f:entry title="Pool definitions">
             <f:repeatable var="pool" items="${descriptor.pools}">
                 <table width="100%">
+                	<f:entry title="Global" help="/plugin/port-allocator/help-pool-definition-global.html">
+                		<f:checkbox name="pool.global" checked="${pool.global}"/>
+                	</f:entry>
                     <f:entry title="Name" help="/plugin/port-allocator/help-pool-definition-name.html">
                         <f:textbox name="pool.name" value="${pool.name}"
                             checkUrl="'descriptorByName/PortAllocator/checkName?value='+this.value" />
diff --git a/src/main/webapp/help-pool-definition-global.html b/src/main/webapp/help-pool-definition-global.html
new file mode 100644
index 0000000..aa722aa
--- /dev/null
+++ b/src/main/webapp/help-pool-definition-global.html
@@ -0,0 +1,5 @@
+<div>
+    <p>
+        Should this pool allocate unique port numbers globally or per node.
+    </p>
+</div>
\ No newline at end of file