--- src/radius.h.orig	2013-06-11 16:00:00.000000000 +0700
+++ src/radius.h	2013-07-04 15:51:37.000000000 +0700
@@ -119,6 +119,9 @@
   #define RAD_MPD_IFACE_GROUP	22
   #define RAD_MPD_DROP_USER	154
 
+  #define RAD_VENDOR_CISCO	9
+  #define RAD_CISCO_NAS_PORT	2
+
   /* Configuration options */
   enum {
     RADIUS_CONF_MESSAGE_AUTHENTIC
--- src/radius.c.orig	2013-06-11 16:00:00.000000000 +0700
+++ src/radius.c	2013-07-04 15:50:30.000000000 +0700
@@ -709,6 +709,14 @@ RadiusStart(AuthData auth, short request
 		auth->info.lnkname, rad_strerror(auth->radius.handle)));
 		return (RAD_NACK);
 	}
+	Log(LG_RADIUS2, ("[%s] RADIUS: Put RAD_CISCO_NAS_PORT: %s", 
+        auth->info.lnkname, auth->params.peeriface));
+	if (rad_put_vendor_string(auth->radius.handle, RAD_VENDOR_CISCO,
+		RAD_CISCO_NAS_PORT, auth->params.peeriface) != 0) {
+	    Log(LG_RADIUS, ("[%s] RADIUS: Put RAD_CISCO_NAS_PORT: %s",
+		auth->info.lnkname, rad_strerror(auth->radius.handle)));
+    		return (RAD_NACK);
+	}
     }
 
     Log(LG_RADIUS2, ("[%s] RADIUS: Put RAD_MPD_LINK: %s",