diff --git a/network/interface.go b/network/interface.go
index 6bad7a2..cc0eec2 100644
--- a/network/interface.go
+++ b/network/interface.go
@@ -82,7 +82,11 @@ func (i *logicalInterface) Netdev() string {
 }
 
 func (i *logicalInterface) Filename() string {
-	return fmt.Sprintf("%02x-%s", i.configDepth, i.name)
+	name := i.name
+	if name == "" {
+		name = i.hwaddr.String()
+	}
+	return fmt.Sprintf("%02x-%s", i.configDepth, name)
 }
 
 func (i *logicalInterface) Children() []networkInterface {
diff --git a/network/interface_test.go b/network/interface_test.go
index 51d9458..c2ec3dc 100644
--- a/network/interface_test.go
+++ b/network/interface_test.go
@@ -344,6 +344,8 @@ func TestFilename(t *testing.T) {
 		{logicalInterface{name: "iface", configDepth: 9}, "09-iface"},
 		{logicalInterface{name: "iface", configDepth: 10}, "0a-iface"},
 		{logicalInterface{name: "iface", configDepth: 53}, "35-iface"},
+		{logicalInterface{hwaddr: net.HardwareAddr([]byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xab}), configDepth: 1}, "01-01:23:45:67:89:ab"},
+		{logicalInterface{name: "iface", hwaddr: net.HardwareAddr([]byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xab}), configDepth: 1}, "01-iface"},
 	} {
 		if tt.i.Filename() != tt.f {
 			t.Fatalf("bad filename (%q): got %q, want %q", tt.i, tt.i.Filename(), tt.f)