1 files changed, 14 insertions, 2 deletions

diff --git a/bin/NS2SetMac.sh b/bin/NS2SetMac.sh
index 51810ae..e6111c7 100755
--- a/bin/NS2SetMac.sh
+++ b/bin/NS2SetMac.sh
@@ -1,2 +1,6 @@
-# store/set MAC address for given interface
+# this script is part of networksettings2 package
+# purpose : set fixed MAC address for network devices that
+#           have random addresses (like usb)
+#
+
 NS2MacStore=/etc/NS2
@@ -13,3 +17,7 @@ then
   # set this mac
-  /sbin/ifconfig $1 hw ether `cat ${NS2MacStore}/$1.mac`
+  X=`cat ${NS2MacStore}/$1.mac`
+  if [ ! -z "$X" ]
+  then
+    /sbin/ifconfig $1 hw ether $X
+  fi
 else
@@ -19,4 +27,8 @@ else
   X=${X%% *} # remove trailing spaces
+  if [ ! -z "$X" ]
+  then
+    # valid mac address
   echo ${X} > ${NS2MacStore}/$1.mac
 fi
+fi
 exit 0