diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 441cd4a..c98d556 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,4 +1,5 @@
 ChangeLog Responder 1.9:
+- Added: -I command line switch (network interface). When set, this option override Responder.conf Bind_to setting.
 - Added: Ability to change the HTML payload returned after authentication. See Responder.conf
 - Added: Ability to change the pac script in Responder.conf
 - Added: Configuration file for Responder. See Responder.conf
diff --git a/README.txt b/README.txt
index 314f900..8e85abd 100644
--- a/README.txt
+++ b/README.txt
@@ -118,7 +118,7 @@ Running this tool:
 
 Usage Example:
 
-python Responder.py -i 10.20.30.40 -b On -r On
+python Responder.py -i 10.20.30.40 -b On -r On -I eth0
 
 Options List:
 
@@ -127,6 +127,8 @@ Options List:
 -i 10.20.30.40, --ip=10.20.30.40     The ip address to redirect the traffic to.
                                      (usually yours)
 
+-I eth0, --interface=eth0            Network interface to use
+
 -b Off, --basic=Off                  Set this to On if you want to return a 
                                      Basic HTTP authentication. Off will return 
                                      an NTLM authentication.
diff --git a/Responder.py b/Responder.py
index 1d58423..c3e60b9 100644
--- a/Responder.py
+++ b/Responder.py
@@ -28,6 +28,8 @@ parser = optparse.OptionParser(usage='python %prog -i 10.20.30.40 -b On -r On',
                                )
 parser.add_option('-i','--ip', action="store", help="The ip address to redirect the traffic to. (usually yours)", metavar="10.20.30.40",dest="OURIP")
 
+parser.add_option('-I','--interface', action="store", help="Network interface to use", metavar="eth0", dest="INTERFACE", default="Not set")
+
 parser.add_option('-b', '--basic',action="store", help="Set this to On if you want to return a Basic HTTP authentication. Off will return an NTLM authentication.This option is mandatory.", metavar="Off",dest="Basic", choices=['On','ON','Off','OFF'], default="Off")
 
 parser.add_option('-r', '--wredir',action="store", help="Set this to enable answers for netbios wredir suffix queries. Answering to wredir will likely break stuff on the network (like classics 'nbns spoofer' will). Default value is therefore set to Off", metavar="Off",dest="Wredirect", choices=['On','ON','Off','OFF'], default="Off")
@@ -73,10 +75,14 @@ WPAD_On_Off = options.WPAD_On_Off.upper()
 Wredirect = options.Wredirect.upper()
 Basic = options.Basic.upper()
 Finger_On_Off = options.Finger.upper()
+INTERFACE = options.INTERFACE
 
 if BIND_TO_Interface == None:
    BIND_TO_Interface = 'eth0'
 
+if INTERFACE != "Not set":
+   BIND_TO_Interface = INTERFACE
+
 if len(NumChal) is not 16:
    print "The challenge must be exactly 16 chars long.\nExample: -c 1122334455667788\n"
    parser.print_help()
@@ -115,7 +121,7 @@ Challenge = ""
 for i in range(0,len(NumChal),2):
     Challenge += NumChal[i:i+2].decode("hex")
 
-Show_Help("[+]NBT-NS & LLMNR responder started\n[+]Loading Responder.conf File..\nGlobal Parameters set:\nChallenge set is: %s\nWPAD Proxy Server is:%s\nWPAD script loaded:%s\nHTTP Server is:%s\nHTTPS Server is:%s\nSMB Server is:%s\nSMB LM support is set to:%s\nSQL Server is:%s\nFTP Server is:%s\nDNS Server is:%s\nLDAP Server is:%s\nFingerPrint Module is:%s\nServing Executable via HTTP&WPAD is:%s\nAlways Serving a Specific File via HTTP&WPAD is:%s\n\n"%(NumChal,WPAD_On_Off,WPAD_Script,On_Off,SSL_On_Off,SMB_On_Off,LM_On_Off,SQL_On_Off,FTP_On_Off,DNS_On_Off,LDAP_On_Off,Finger_On_Off,Exe_On_Off,Exec_Mode_On_Off))
+Show_Help("[+]NBT-NS & LLMNR responder started\n[+]Loading Responder.conf File..\nGlobal Parameters set:\nResponder is bound to this interface:%s\nChallenge set is: %s\nWPAD Proxy Server is:%s\nWPAD script loaded:%s\nHTTP Server is:%s\nHTTPS Server is:%s\nSMB Server is:%s\nSMB LM support is set to:%s\nSQL Server is:%s\nFTP Server is:%s\nDNS Server is:%s\nLDAP Server is:%s\nFingerPrint Module is:%s\nServing Executable via HTTP&WPAD is:%s\nAlways Serving a Specific File via HTTP&WPAD is:%s\n\n"%(BIND_TO_Interface, NumChal,WPAD_On_Off,WPAD_Script,On_Off,SSL_On_Off,SMB_On_Off,LM_On_Off,SQL_On_Off,FTP_On_Off,DNS_On_Off,LDAP_On_Off,Finger_On_Off,Exe_On_Off,Exec_Mode_On_Off))
 
 #Simple NBNS Services.
 W_REDIRECT   = "\x41\x41\x00"
@@ -1472,18 +1478,18 @@ class ThreadingUDPServer(ThreadingMixIn, UDPServer):
     def server_bind(self):
         try:
            self.socket.setsockopt(socket.SOL_SOCKET, 25, BIND_TO_Interface+'\0')
-           UDPServer.server_bind(self)
         except:
            print "Non existant network interface provided in Responder.conf, please provide a valid interface."
+        UDPServer.server_bind(self)
 
 class ThreadingTCPServer(ThreadingMixIn, TCPServer):
     
     def server_bind(self):
         try:
            self.socket.setsockopt(socket.SOL_SOCKET, 25, BIND_TO_Interface+'\0')
-           TCPServer.server_bind(self)
         except:
            print "Non existant network interface provided in Responder.conf, please provide a valid interface."
+        TCPServer.server_bind(self)
 
 ThreadingUDPServer.allow_reuse_address = 1
 ThreadingTCPServer.allow_reuse_address = 1