diff --git a/start.sh b/start.sh
index 0136f8e..e7608b0 100755
--- a/start.sh
+++ b/start.sh
@@ -38,6 +38,7 @@ vde_plug --daemon switch:///tmp/switch2 null://
 
 # Connect to the exterior
 sudo vde_plug --daemon vde:///tmp/ext tap://vde0
+sudo ip link set dev vde0 address 02:00:00:00:00:00
 sudo ip link set dev vde0 up
 sudo ip address add 10.2.1.1/30 dev vde0
 sudo ip address add 2a0c:700:3012:3::ff:0/127 dev vde0
@@ -59,7 +60,8 @@ for i in 1 2 3 4; do
   if [[ $i -eq 1 ]]; then
     tmux send-keys -t ns$i "vde_plug --daemon vde:///tmp/ext tap://vde0" Enter
     sleep 0.3
-    tmux send-keys -t ns$i "ip link set vde0 up" Enter
+    tmux send-keys -t ns$i "ip link set dev vde0 address 02:00:00:00:00:01" Enter
+    tmux send-keys -t ns$i "ip link set dev vde0 up" Enter
     tmux send-keys -t ns$i "ip address add 10.2.1.2/30 dev vde0" Enter
     tmux send-keys -t ns$i "ip address add 2a0c:700:3012:3::ff:1/127 dev vde0" Enter
     tmux send-keys -t ns$i "ip route add default via 10.2.1.1 dev vde0 proto kernel" Enter
@@ -77,7 +79,8 @@ echo "Enable links..."
 for i in 1 2 3; do
   tmux send-keys -t ns$i "vde_plug --daemon vde:///tmp/switch1 tap://vde1" Enter
   sleep 0.3
-  tmux send-keys -t ns$i "ip link set vde1 up" Enter
+  tmux send-keys -t ns$i "ip link set dev vde1 address 02:00:00:00:01:0$i" Enter
+  tmux send-keys -t ns$i "ip link set dev vde1 up" Enter
   tmux send-keys -t ns$i "ip address add 172.17.1.$i/32 dev vde1" Enter
   tmux send-keys -t ns$i "ip address add 2a0c:700:3012:3::1:$i/128 dev vde1" Enter
   tmux send-keys -t ns$i "echo \"interface vde1 type wired\" >> /tmp/ns$i/babeld.conf" Enter
@@ -87,7 +90,8 @@ done
 for i in 2 3 4; do
   tmux send-keys -t ns$i "vde_plug --daemon vde:///tmp/switch2 tap://vde2" Enter
   sleep 0.3
-  tmux send-keys -t ns$i "ip link set vde2 up" Enter
+  tmux send-keys -t ns$i "ip link set dev vde2 address 02:00:00:00:02:0$i" Enter
+  tmux send-keys -t ns$i "ip link set dev vde2 up" Enter
   tmux send-keys -t ns$i "ip address add 172.17.2.$i/32 dev vde2" Enter
   tmux send-keys -t ns$i "ip address add 2a0c:700:3012:3::2:$i/128 dev vde2" Enter
   tmux send-keys -t ns$i "echo \"interface vde2 type wired\" >> /tmp/ns$i/babeld.conf" Enter