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--- a
+++ b/src/CS/InteriorRouter4Int.ned
@@ -0,0 +1,57 @@
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+// 
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see http://www.gnu.org/licenses/.
+// 
+
+package rina.CS;
+
+import rina.DAF.DA.DIFAllocator;
+import rina.DIF.IPCProcess;
+
+
+module InteriorRouter4Int
+{
+    @display("i=abstract/switch;bgb=396,371");
+    @node;
+    gates:
+        inout medium[4];
+    submodules:
+        ipcProcess0: IPCProcess {
+            @display("p=93,147");
+        }
+        ipcProcess1: IPCProcess {
+            @display("p=327,147");
+        }
+        relayIpc: IPCProcess {
+            @display("p=209,215;i=,#FFB000");
+            relay = true;
+        }
+        difAllocator: DIFAllocator {
+            @display("p=65,53");
+        }
+        ipcProcess2: IPCProcess {
+            @display("p=93,274");
+        }
+        ipcProcess3: IPCProcess {
+            @display("p=327,274");
+        }
+    connections allowunconnected:
+        ipcProcess0.southIo++ <--> medium[0];
+        ipcProcess1.southIo++ <--> medium[1];
+        ipcProcess2.southIo++ <--> medium[2];
+        ipcProcess3.southIo++ <--> medium[3];
+        relayIpc.southIo++ <--> ipcProcess0.northIo++;
+        relayIpc.southIo++ <--> ipcProcess1.northIo++;
+        relayIpc.southIo++ <--> ipcProcess2.northIo++;
+        relayIpc.southIo++ <--> ipcProcess3.northIo++;
+}