let's just compare MAC address strings

gyro.go

@@ -1,9 +1,7 @@
 package main
 
 import (
-	"bytes"
 	"log"
-	"net"
 	"os"
 	"os/exec"
 	"time"
@@ -23,11 +21,6 @@ func main() {
 
 	log.Printf("Starting gyro at %s", time.Now().Format(time.RFC3339))
 
-	mac, err := net.ParseMAC(dashMAC)
-	if err != nil {
-		log.Fatalf("Unable to parse MAC address %q: %s", dashMAC, err)
-	}
-
 	dhcp, err := dhcp4.NewSnooperConn("0.0.0.0:67")
 	if err != nil {
 		log.Fatalf("Cannot start DHCP server: %s", err)
@@ -43,7 +36,7 @@ func main() {
 			continue
 		}
 
-		if !bytes.Equal(pkt.HardwareAddr, mac) {
+		if pkt.HardwareAddr.String() != dashMAC {
 			continue
 		}