--- apache-jmeter-2.8/src/core/org/apache/jmeter/resources/messages.properties	2012-10-02 22:29:05.000000000 +0200
+++ apache-jmeter-2.8/src/core/org/apache/jmeter/resources/messages.properties	2012-11-08 04:56:23.802050201 +0200
@@ -1162,7 +1162,7 @@ 
 web_server_timeout_connect=Connect:
 web_server_timeout_response=Response:
 web_server_timeout_title=Timeouts (milliseconds)
-web_testing2_source_ip=Source IP address:
+web_testing2_source_ip=Source IP address / device:
 web_testing2_title=HTTP Request HTTPClient
 web_testing_concurrent_download=Use concurrent pool. Size:
 web_testing_embedded_url_pattern=Embedded URLs must match\:
--- apache-jmeter-2.8/src/protocol/http/org/apache/jmeter/protocol/http/sampler/HTTPHC4Impl.java	2012-10-02 22:29:01.000000000 +0200
+++ apache-jmeter-2.8/src/protocol/http/org/apache/jmeter/protocol/http/sampler/HTTPHC4Impl.java	2012-11-08 04:53:15.591076581 +0200
@@ -30,9 +30,15 @@ 
 import java.nio.charset.Charset;
 import java.security.GeneralSecurityException;
 import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Enumeration;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.net.Inet4Address;
+import java.net.Inet6Address;
+import java.net.NetworkInterface;
+import java.net.SocketException;
 
 import org.apache.commons.lang3.StringUtils;
 import org.apache.http.Header;
@@ -568,6 +574,33 @@ 
         return httpClient;
     }
 
+    static private String getInterfaceAddress(String interfaceName) throws SocketException {
+        // By default use ipv4 addresses
+        Class<?> inetClass = Inet4Address.class;
+        if (interfaceName.toLowerCase().startsWith("ipv6:")) {
+            interfaceName = interfaceName.substring(5);
+            inetClass = Inet6Address.class;
+        } else {
+            if ( interfaceName.toLowerCase().startsWith("ipv4:")) {
+                interfaceName = interfaceName.substring(5);
+            }
+        }
+
+        Enumeration<NetworkInterface> nets = NetworkInterface.getNetworkInterfaces();
+        for (NetworkInterface netInterface : Collections.list(nets)) {
+            if (netInterface.getName().equals(interfaceName)) {
+                Enumeration<InetAddress> inetAddresses = netInterface.getInetAddresses();
+                ArrayList<InetAddress> inetAddressesList = Collections.list(inetAddresses);
+                for (int i=0; i < inetAddressesList.size(); i++) {
+                    if (inetClass == inetAddressesList.get(i).getClass()) {
+                        return inetAddressesList.get(i).getHostAddress();
+                    }
+                }
+            }
+        }
+        return "";
+    }
+
     private void setupRequest(URL url, HttpRequestBase httpRequest, HTTPSampleResult res)
         throws IOException {
 
@@ -576,8 +609,16 @@ 
     // Set up the local address if one exists
     final String ipSource = getIpSource();
     if (ipSource.length() > 0) {// Use special field ip source address (for pseudo 'ip spoofing')
-        InetAddress inetAddr = InetAddress.getByName(ipSource);
-        requestParams.setParameter(ConnRoutePNames.LOCAL_ADDRESS, inetAddr);
+        // Try to treat ipSource as interface
+        String interfaceAddress = getInterfaceAddress(ipSource);
+        if (interfaceAddress.length() > 0) {
+            InetAddress inetAddr = InetAddress.getByName(interfaceAddress);
+            requestParams.setParameter(ConnRoutePNames.LOCAL_ADDRESS, inetAddr);
+        }
+        else {
+            InetAddress inetAddr = InetAddress.getByName(ipSource);
+            requestParams.setParameter(ConnRoutePNames.LOCAL_ADDRESS, inetAddr);
+        }
     } else if (localAddress != null){
         requestParams.setParameter(ConnRoutePNames.LOCAL_ADDRESS, localAddress);
     } else { // reset in case was set previously
--- apache-jmeter-2.8/xdocs/usermanual/component_reference.xml	2012-10-02 22:29:00.000000000 +0200
+++ apache-jmeter-2.8/xdocs/usermanual/component_reference.xml	2012-11-08 04:52:12.111434584 +0200
@@ -316,9 +316,10 @@ 
         </property>
         <property name="Use concurrent pool" required="No">Use a pool of concurrent connections to get embedded resources.</property>
         <property name="Size" required="No">Pool size for concurrent connections used to get embedded resources.</property>
-        <property name="Source IP address:" required="No">
+        <property name="Source IP address / device:" required="No">
         [Only for HTTP Request HTTPClient] 
         Override the default local IP address for this sample.
+        To specify a device use ipvX:device, for instance 'ipv4:eth0'. If IP family not specified, ipv4 used by default.
         The JMeter host must have multiple IP addresses (i.e. IP aliases or network interfaces). 
         If the property <b>httpclient.localaddress</b> is defined, that is used for all HttpClient requests.
         </property>