Instructions.markdown

+Before continuing with the instructions,  please check the [Installation page](./Installation) to clarify that you have installed everything.
+
+# **EPC/Mininet PC**
+
+**Run mininet**
+```
+sudo python ~/mininet/custom/datacenterTest.py
+```
+
+If everything is fine, it will appear on this terminal a list of switches (s0-s1), hosts (h0-h63) and a Nat. 
+
+**Run the EPC within Mininet**
+
+In the terminal of Mininet: 
+```
+mininet> xterm h0 h0 h0
+```
+
+
+Now, there are three Minitet terminal of the host0. We totally recommend to launch the EPC in the host0 because the EPC configuration is linked to this host.
+
+**In one mininet terminal run the hss:**
+
+```
+sudo ~/openair-cn/scripts/./run_hss
+```
+
+**In another mininet terminal run the mme:**
+```
+sudo ~/openair-cn/scripts/./run_mme
+```
+
+**Important to check that this appears on the hss terminal:**
+'STATE_CLOSED' -> 'STATE_OPEN' 'imdeaEPC.my.realm'
+
+![hss_crop](/uploads/f012351bd6955f247cf2454fed008925/hss_crop.png)
+
+
+
+**Finally, run the spgw:**
+
+```
+sudo ~/openair-cn/scripts/./run_spgw
+```
+
+# **eNodeB PC**
+
+ **Pre srsLTE eNodeB configuration**
+
+Go to the srsLTE folder
+
+```
+cd ~/path_to_srsLTE/
+```
+
+```
+sudo gedit build/srsenb/src/enb.conf
+```
+
+And change these lines to those ones:
+
+```
+tac = 0x0001
+mcc = 208
+mnc = 95
+mme_addr = 10.0.0.1 #mininet host0 IP
+gtp_bind_addr = X.X.X.X
+```
+X.X.X.X is the IP of the physical host (enb) interface connected to Mininet
+
+**Change the route to connect to Mininet and to the EPC gateway:**
+
+```
+sudo ip route add 10.0.0.0/12 via Y.Y.Y.Y
+sudo ip route add 10.16.0.0/12 via Y.Y.Y.Y
+```
+
+Y.Y.Y.Y is the IP of the virtual machine (the Mininet/EPC virtual machine)
+
+**Execute the eNodeB code**
+
+```
+sudo build/srsenb/src/./srsenb enb.conf
+```
+
+If it is well connected, **it will appear one enb connected/attached on the MME terminal**.
+
+![mme_enb_crop](/uploads/ed1dac3c483360a33102ca972d01fa8d/mme_enb_crop.png)
+
+# **UE PC**
+
+**Go to the srsLTE folder**
+
+```
+cd ~/path_to_srsLTE/
+```
+
+**Pre srsLTE configuration**
+
+```
+sudo gedit build/srsue/src/ue.conf
+```
+Change these lines to those ones:
+
+```
+algo = milenage
+op   = 840337C3D45397CE8EA8609FFDC47224
+#amf  = 8000
+k    = 352857A8F4EB1C1EF485F4356CC925D0
+imsi = 901700000012948
+```
+**Execute the UE code**
+
+```
+sudo build/srsue/src/./srsue ue.conf
+```
+It the UE is well connected to the eNodeB and to the EPC, you will see on the eNodeB terminal:
+
+![enb_crop](/uploads/47e996f306daa71b5f2f38033fbc4a8c/enb_crop.png)
+
+In addition, in the MME terminal you should see on the statistics one connected and attached UE .
+
+Finally, the the EPC gives an IP to the UE. This IP appears on the UE terminal. Note that this IP has to be within the range of 10.16.0.0/12:
+
+![UE_crop](/uploads/39044e8335e47b429bce951ed8572092/UE_crop.png)
+
+**Add the route to connect the UE to the gateway**
+
+```
+sudo route add default gw 10.16.0.1
+```
+
+At this moment, the UE can do ping to the EPC. **If you want to connect to internet, it is needed to change the DNS server**
+
+```
+sudo gedit /etc/resolv.conf
+```
+
+Add this line at the end:
+```
+nameserver 8.8.8.8
+```
+At this moment, the UE has total connectivity to internet. Have fun!
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