diff --git a/src/Host.cpp b/src/Host.cpp
index c3cc0ef..57372e9 100644
--- a/src/Host.cpp
+++ b/src/Host.cpp
@@ -5,53 +5,85 @@
  *      Author: jdi
  */
 
-
 //TODO clean up
 #include <cstdio>
-//#include <cerrno>
 #include <cstring>
 #include <cstdlib>
 #include <iostream>
-#include <sys/types.h>
-#include <arpa/inet.h>
-#include <sys/socket.h>
+#include <fstream>
 #include <netdb.h>
 #include <ifaddrs.h>
 #include <unistd.h>
-//#include <linux/if_link.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <linux/if_link.h>
+#include <net/if.h>
+
 #include "Options.h"
 #include "Host.h"
 #include "Types/Types.h"
-//#include "bytes.h"
 
 macAddr Host::getMac() {
-	macAddr ret { 0x6a,0x49,0x16,0x17,0x2e,0x8d }; //TODO find actual MAC Address
-	return ret;
+    int s;
+    struct ifreq buffer;
+	macAddr data { 0, 0, 0, 0, 0, 0 };
+    s = socket(PF_INET, SOCK_DGRAM, 0);
+    memset(&buffer, 0x00, sizeof(buffer));
+    strcpy(buffer.ifr_name, options.interface.c_str());
+    ioctl(s, SIOCGIFHWADDR, &buffer);
+    close(s);
+	memcpy(&data[0], &buffer.ifr_hwaddr.sa_data[0], 6);
+	return data;
 }
 
 ipAddr Host::getIp() {
 	struct ifaddrs *ifaddr, *ifa;
 	int n;
 	ipAddr data { 0, 0, 0, 0 };
-
 	if (getifaddrs(&ifaddr) == -1) {
 		perror("getifaddrs");
 		exit(EXIT_FAILURE);
 	}
-
 	for (ifa = ifaddr, n = 0; ifa != NULL; ifa = ifa->ifa_next, n++) {
 		if (ifa->ifa_addr == NULL)
 			continue;
-
-		if (ifa->ifa_addr->sa_family == AF_INET) {
+		if (ifa->ifa_addr->sa_family == AF_INET)
 			if (options.interface.compare(ifa->ifa_name) == 0) {
 				memcpy(&data[0], &ifa->ifa_addr->sa_data[2], 4);
 				return data;
 			}
-		}
 	}
-
 	freeifaddrs(ifaddr);
 	return data;
 }
 
+std::string Host::getIface() {
+	std::string defaultInterface;
+	std::ifstream routeFile("/proc/net/route", std::ios_base::in);
+	if (!routeFile.good())
+		return "";
+	std::string line;
+	std::vector<std::string> tokens;
+	if (std::getline(routeFile, line))
+		while (std::getline(routeFile, line)) {
+			std::istringstream stream(line);
+			std::string delimiter = "\t";
+			size_t pos = 0;
+			std::string token;
+			while ((pos = line.find(delimiter)) != std::string::npos) {
+				token = line.substr(0, pos);
+				tokens.push_back(token);
+				line.erase(0, pos + delimiter.length());
+			}
+			if ((tokens.size() >= 2)
+					&& (tokens[1] == std::string("00000000"))) {
+				defaultInterface = tokens[0];
+				break;
+			}
+			tokens.clear();
+		}
+	routeFile.close();
+	return defaultInterface;
+}
diff --git a/src/Host.h b/src/Host.h
index 1e4d223..7387804 100644
--- a/src/Host.h
+++ b/src/Host.h
@@ -15,6 +15,7 @@ public:
 	Host(){};
 	macAddr getMac();
 	ipAddr getIp();
+	std::string getIface();
 };
 
 #endif /* HOST_H_ */
diff --git a/src/Program.cpp b/src/Program.cpp
index 0a6cd84..e173b09 100644
--- a/src/Program.cpp
+++ b/src/Program.cpp
@@ -17,10 +17,9 @@
 
 int Program::list() {
 
-	Host h = Host();
 	printf("List:\n");
 	Packet p = Packet(Packet::DISCOVERY);
-	p.setHostMac(h.getMac());
+	p.setHostMac(host.getMac());
 	p.setPayload( { });
 	bytes a = p.getBytes();
 	p.encode(a);
@@ -28,7 +27,7 @@ int Program::list() {
 	try {
 		asio::io_service io_service;
 		Socket s(io_service);
-		s.setHostIp(h.getIp());
+		s.setHostIp(host.getIp());
 		s.init(DST_PORT, SRC_PORT);
 		s.callback =
 				[](Packet a) {
@@ -55,7 +54,6 @@ int Program::list() {
 	} catch (std::exception& e) {
 		std::cerr << "Exception: " << e.what() << "\n";
 	}
-
 	return 1;
 }
 
@@ -63,9 +61,8 @@ int Program::sniff() {
 	printf("Listening:\n");
 	try {
 		asio::io_service io_service;
-		Host h = Host();
 		Socket s(io_service);
-		s.setHostIp(h.getIp());
+		s.setHostIp(host.getIp());
 		s.init(DST_PORT, SRC_PORT);
 		s.callback =
 				[](Packet p) {
@@ -98,7 +95,6 @@ int Program::sniff() {
 							}
 						}
 					}
-
 					return 0;
 				};
 		s.listen();
@@ -122,12 +118,11 @@ int Program::setProperty() {
 	return 0;
 }
 int Program::getProperty() {
-	Host h = Host();
 	printf("Get:\n");
 	Packet p = Packet(Packet::GET);
 	macAddr d = { 0x14, 0xcc, 0x20, 0x49, 0x5e, 0x07 };
 	p.setSwitchMac(d);
-	p.setHostMac(h.getMac());
+	p.setHostMac(host.getMac());
 	datasets t = { { 2305, 0, { } } };
 	p.setPayload(t);
 	bytes a = p.getBytes();
@@ -136,7 +131,7 @@ int Program::getProperty() {
 	try {
 		asio::io_service io_service;
 		Socket s(io_service);
-		s.setHostIp(h.getIp());
+		s.setHostIp(host.getIp());
 		s.init(DST_PORT, SRC_PORT);
 		s.callback =
 				[](Packet a) {
@@ -186,3 +181,7 @@ int Program::reset() {
 
 	return 0;
 }
+void Program::init() {
+	if(options.interface.compare("")==0)
+		options.interface = host.getIface();
+}
diff --git a/src/Program.h b/src/Program.h
index 32733d1..4e7e84e 100644
--- a/src/Program.h
+++ b/src/Program.h
@@ -9,13 +9,12 @@
 #define PROGRAM_H_
 
 #include "Types/Types.h"
-
-#define SRC_PORT 29809
-#define DST_PORT 29808
+#include "Host.h"
 
 class Program {
 public:
 	Program(){}
+	void init();
 	int list();
 	int sniff();
 	int encode(std::string);
@@ -26,6 +25,8 @@ public:
 	int flash();
 	int reboot();
 	int reset();
+private:
+	Host host = Host();
 };
 
 #endif /* PROGRAM_H_ */
diff --git a/src/Socket.h b/src/Socket.h
index c61b704..fbb7f67 100644
--- a/src/Socket.h
+++ b/src/Socket.h
@@ -12,6 +12,9 @@
 #include "Packet.h"
 #include "Types/Types.h"
 
+#define SRC_PORT 29809
+#define DST_PORT 29808
+
 #define MAX_LENGTH 1024
 
 class Socket {
diff --git a/src/smrtlink.cpp b/src/smrtlink.cpp
index 0792109..971241b 100644
--- a/src/smrtlink.cpp
+++ b/src/smrtlink.cpp
@@ -113,6 +113,8 @@ int main(int argc, char *argv[]) {
 		exit(EXIT_FAILURE);
 	}
 
+	p.init();
+
 	if (optind < argc) {
 		std::string cmd = std::string(argv[optind++]);