diff --git a/vendor/go.etcd.io/etcd/pkg/netutil/isolate_linux.go b/vendor/go.etcd.io/etcd/pkg/netutil/isolate_linux.go
new file mode 100644
index 0000000..418580a
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/pkg/netutil/isolate_linux.go
@@ -0,0 +1,82 @@
+// Copyright 2015 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package netutil
+
+import (
+	"fmt"
+	"os/exec"
+)
+
+// DropPort drops all tcp packets that are received from the given port and sent to the given port.
+func DropPort(port int) error {
+	cmdStr := fmt.Sprintf("sudo iptables -A OUTPUT -p tcp --destination-port %d -j DROP", port)
+	if _, err := exec.Command("/bin/sh", "-c", cmdStr).Output(); err != nil {
+		return err
+	}
+	cmdStr = fmt.Sprintf("sudo iptables -A INPUT -p tcp --destination-port %d -j DROP", port)
+	_, err := exec.Command("/bin/sh", "-c", cmdStr).Output()
+	return err
+}
+
+// RecoverPort stops dropping tcp packets at given port.
+func RecoverPort(port int) error {
+	cmdStr := fmt.Sprintf("sudo iptables -D OUTPUT -p tcp --destination-port %d -j DROP", port)
+	if _, err := exec.Command("/bin/sh", "-c", cmdStr).Output(); err != nil {
+		return err
+	}
+	cmdStr = fmt.Sprintf("sudo iptables -D INPUT -p tcp --destination-port %d -j DROP", port)
+	_, err := exec.Command("/bin/sh", "-c", cmdStr).Output()
+	return err
+}
+
+// SetLatency adds latency in millisecond scale with random variations.
+func SetLatency(ms, rv int) error {
+	ifces, err := GetDefaultInterfaces()
+	if err != nil {
+		return err
+	}
+
+	if rv > ms {
+		rv = 1
+	}
+	for ifce := range ifces {
+		cmdStr := fmt.Sprintf("sudo tc qdisc add dev %s root netem delay %dms %dms distribution normal", ifce, ms, rv)
+		_, err = exec.Command("/bin/sh", "-c", cmdStr).Output()
+		if err != nil {
+			// the rule has already been added. Overwrite it.
+			cmdStr = fmt.Sprintf("sudo tc qdisc change dev %s root netem delay %dms %dms distribution normal", ifce, ms, rv)
+			_, err = exec.Command("/bin/sh", "-c", cmdStr).Output()
+			if err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+// RemoveLatency resets latency configurations.
+func RemoveLatency() error {
+	ifces, err := GetDefaultInterfaces()
+	if err != nil {
+		return err
+	}
+	for ifce := range ifces {
+		_, err = exec.Command("/bin/sh", "-c", fmt.Sprintf("sudo tc qdisc del dev %s root netem", ifce)).Output()
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}