diff --git a/plugin2544/plugin/learning.py b/plugin2544/plugin/learning.py
index 9318dfd..04e52c2 100644
--- a/plugin2544/plugin/learning.py
+++ b/plugin2544/plugin/learning.py
@@ -59,7 +59,7 @@ def get_bytes_from_macaddress(dmac: "MacAddress") -> Iterator[str]:
 
 def get_link_local_uci_ipv6address(dmac: "MacAddress") -> str:
     b = get_bytes_from_macaddress(dmac)
-    return f"FE80000000000000{int(next(b)) | 2 }{next(b)}{next(b)}FFFE{next(b)}{next(b)}{next(b)}"
+    return f"FE80000000000000{int(next(b), 16) | 2 }{next(b)}{next(b)}FFFE{next(b)}{next(b)}{next(b)}"[:-1]
 
 
 def get_address_list(
@@ -125,7 +125,7 @@ async def get_address_learning_packet(
             packet = NDPPacket(
                 smac=smac,
                 source_ip=IPv6Address(source_ip),
-                destination_ip=IPv6Address(destination_ip),
+                destination_ip=IPv6Address(int(destination_ip, 16)),
                 dmac=dmac,
             ).make_ndp_packet()
         packet_list.append(packet)
diff --git a/plugin2544/plugin/structure.py b/plugin2544/plugin/structure.py
index 6fdad6f..2910f1d 100644
--- a/plugin2544/plugin/structure.py
+++ b/plugin2544/plugin/structure.py
@@ -13,7 +13,6 @@
 from .stream_struct import StreamStruct
 from ..utils import exceptions, constants as const
 from ..utils.field import MacAddress, NonNegativeDecimal
-
 if TYPE_CHECKING:
     from xoa_core.core.test_suites.datasets import PortIdentity
     from xoa_driver import ports as xoa_ports, testers as xoa_testers
@@ -108,7 +107,9 @@ async def set_broadr_reach_mode(self, broadr_reach_mode: const.BRRModeStr) -> No
             await self.port_ins.brr_mode.set(broadr_reach_mode.to_xmp())
 
     async def set_mdi_mdix_mode(self, mdi_mdix_mode: const.MdiMdixMode) -> None:
-        if self.port_ins.info.capabilities.can_mdi_mdix == enums.YesNo.NO:
+        is_port_can_mdi_mdix = self.port_ins.info.capabilities.can_mdi_mdix == enums.YesNo.YES
+        is_port_can_set_speed = self.port_ins.info.port_possible_speed_modes
+        if not is_port_can_mdi_mdix or (is_port_can_mdi_mdix and not is_port_can_set_speed):
             self._xoa_out.send_warning(
                 exceptions.MdiMdixModeNotSupport(self._port_identity.name)
             )