diff --git a/client b/client
index dfffe75..ca91b18 100644
--- a/client
+++ b/client
@@ -1,3 +1,13 @@
+local sides = peripheral.getNames()
+for i = 1, #sides do
+    if peripheral.getType(sides[i]) == "modem" then
+        modemSide = sides[i]
+        break
+    end
+end
+
+rednet.open(modemSide)
+
 function dump(o)
     if o == nil then
         return ""
@@ -15,7 +25,6 @@ function dump(o)
     return tostring(o)
 end
 
-rednet.open("left")
 rednet.host("rmm", "t0-turtle01")
 local master = rednet.lookup("rmm", "master")
 while true do
@@ -45,3 +54,4 @@ while true do
     end
 end
 
+rednet.close(modemSide)
diff --git a/control b/control
index f738eaf..77b5035 100644
--- a/control
+++ b/control
@@ -1,3 +1,13 @@
+local sides = peripheral.getNames()
+for i = 1, #sides do
+    if peripheral.getType(sides[i]) == "modem" then
+        modemSide = sides[i]
+        break
+    end
+end
+
+rednet.open(modemSide)
+
 function dump(o)
     if o == nil then
         return ""
@@ -73,10 +83,10 @@ function control()
     end
 end
 
-rednet.open("back")
 rednet.host("rmm", "master")
 
 while true do
     parallel.waitForAny(recv, control)
 end
 
+rednet.close(modemSide)