gnb-ready hint
Change-Id: I047d4af7566eae6216482d5a22d1adbb517162c3
diff --git a/onramp/gnb.rst b/onramp/gnb.rst
index 07e4ca2..1b6b74e 100644
--- a/onramp/gnb.rst
+++ b/onramp/gnb.rst
@@ -17,6 +17,15 @@
the same L2 network as the Aether cluster. In our running example,
this implies both are on subnet ``10.76.28.0/24``.
+.. admonition:: Troubleshooting Hint
+
+ Physical gNBs connect to SD-Core (both the AMF in the control plane
+ and the UPF in the user plane) in exactly the same way as external
+ instances of gNBsim. Going through the process of bringing up gNBsim
+ in a second server, as described in the previous section, is a good
+ way to validate that your Core is "gNB-ready".
+
+
Modify Configuration
~~~~~~~~~~~~~~~~~~~~~~~~