diff --git a/diff b/diff
new file mode 100644
index 0000000..1021a42
--- /dev/null
+++ b/diff
@@ -0,0 +1,13 @@
+diff --git a/sysconfig/network-scripts/ifup-eth b/sysconfig/network-scripts/ifup-eth
+index dd9fb5e..326eba1 100755
+--- a/sysconfig/network-scripts/ifup-eth
++++ b/sysconfig/network-scripts/ifup-eth
+@@ -275,7 +275,7 @@ else
+     # Set a default route.
+     if [ "${DEFROUTE}" != "no" ] && [ -z "${GATEWAYDEV}" -o "${GATEWAYDEV}" = "${REALDEVICE}" ]; then
+ 	# set up default gateway. replace if one already exists
+-	if [ -n "${GATEWAY}" ] && [ "$(ipcalc --network ${GATEWAY} ${NETMASK} 2>/dev/null)" = "NETWORK=${NETWORK}" ]; then
++	if [ -n "${GATEWAY}" ] && [ "$(ipcalc --network ${GATEWAY} ${netmask[0]} 2>/dev/null)" = "NETWORK=${NETWORK}" ]; then
+ 	    ip route replace default ${METRIC:+metric $METRIC} \
+ 		via ${GATEWAY} ${WINDOW:+window $WINDOW} ${SRC} \
+ 		${GATEWAYDEV:+dev $GATEWAYDEV}