diff -ur a/netifrc-0.3.1/net/bonding.sh b/netifrc-0.3.1/net/bonding.sh
--- a/netifrc-0.3.1/net/bonding.sh	2015-01-22 18:10:16.437341577 -0500
+++ b/netifrc-0.3.1/net/bonding.sh	2016-02-10 16:32:29.103309266 -0500
@@ -142,7 +142,19 @@
 		fi
 		# up the interface
 		_up
-    fi
+	fi
+
+	# Apply ethtool config to slaves.
+	if [ "$(command -v "ethtool_pre_start")" = "ethtool_pre_start" ]; then
+		local oiface=${IFACE} oifvar=${IFVAR}
+		for s in ${slaves}; do
+			IFACE=$s
+			IFVAR=$s
+			ethtool_pre_start
+		done
+		IFACE=$oiface
+		IFVAR=$oifvar
+	fi
 
 	# finally add in slaves
 	# things needed in the process, and if they are done by ifenslave, openrc, and/or the kernel.