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-rw-r--r--docs/system/system-users.rst13
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diff --git a/docs/system/system-users.rst b/docs/system/system-users.rst
index 338b8b86..5588e434 100644
--- a/docs/system/system-users.rst
+++ b/docs/system/system-users.rst
@@ -85,3 +85,16 @@ This configuration results in:
secret s3cr3t0816
}
+RADIUS Source Address
+*********************
+
+If you are using e.g. OSPF as IGP always the nearest interface facing the RADIUS
+server is used. With VyOS 1.2 you can bind all outgoing RADIUS requests to a
+single source IP e.g. the loopback interface.
+
+.. code-block:: sh
+
+ set system login radius source-address 3.3.3.3
+
+Above command will use `3.3.3.3` as source IPv4 address for all queries originating
+from this NAS.