fix bug wrong adding rule ebtables

ubuntu_base/if_utils.py

@@ -108,7 +108,7 @@ def drop_ebtables_rule(switch_name, mac_address):
     :param mac_address: the output address to be dropped
     """
     try:
-        subprocess.run(["sudo", "ebtables", "-I", "FORWARD", "--logical-in", switch_name, "-d", mac_address, "-j DROP"], check=True)
+        subprocess.run(["sudo", "ebtables", "-I", "FORWARD", "--logical-in", switch_name, "-d", mac_address, "-j", "DROP"], check=True)
         return True
     except subprocess.CalledProcessError as e:
         print(f"Error executing command: {e}")