diff --git a/vendor/github.com/mdlayher/ethernet/string.go b/vendor/github.com/mdlayher/ethernet/string.go
new file mode 100644
index 0000000..89a3e01
--- /dev/null
+++ b/vendor/github.com/mdlayher/ethernet/string.go
@@ -0,0 +1,38 @@
+// Code generated by "stringer -output=string.go -type=EtherType"; DO NOT EDIT.
+
+package ethernet
+
+import "fmt"
+
+const (
+	_EtherType_name_0 = "EtherTypeIPv4"
+	_EtherType_name_1 = "EtherTypeARP"
+	_EtherType_name_2 = "EtherTypeVLAN"
+	_EtherType_name_3 = "EtherTypeIPv6"
+	_EtherType_name_4 = "EtherTypeServiceVLAN"
+)
+
+var (
+	_EtherType_index_0 = [...]uint8{0, 13}
+	_EtherType_index_1 = [...]uint8{0, 12}
+	_EtherType_index_2 = [...]uint8{0, 13}
+	_EtherType_index_3 = [...]uint8{0, 13}
+	_EtherType_index_4 = [...]uint8{0, 20}
+)
+
+func (i EtherType) String() string {
+	switch {
+	case i == 2048:
+		return _EtherType_name_0
+	case i == 2054:
+		return _EtherType_name_1
+	case i == 33024:
+		return _EtherType_name_2
+	case i == 34525:
+		return _EtherType_name_3
+	case i == 34984:
+		return _EtherType_name_4
+	default:
+		return fmt.Sprintf("EtherType(%d)", i)
+	}
+}