diff -u -r freeradius-server-2.1.12.orig/src/main/radtest.in freeradius-server-2.1.12/src/main/radtest.in
--- freeradius-server-2.1.12.orig/src/main/radtest.in	2011-09-30 10:12:07.000000000 -0400
+++ freeradius-server-2.1.12/src/main/radtest.in	2012-01-05 15:51:56.877585514 -0500
@@ -121,7 +121,7 @@
 	    echo "EAP-Code = Response"
 	    echo "EAP-Type-Identity = \"$1\""
 	fi
-	if [ "$6" ]
+	if [ ! -z "$6" ] && [[ $6 =~ ^[0-9]+$ ]] && [ $6 -gt 0 ]
 	then
 		echo "Framed-Protocol = PPP"
 	fi
Only in freeradius-server-2.1.12/src/main: radtest.in~