fix incorrectly read option IP

ubuntu_base/opportunistic_utils.py

@@ -29,8 +29,8 @@ class CustomIPOption(IPOption):
     def read_entry(self, index):
         if index < self.count:
             # Calculate the offset of the entry in the value field
-            offset = index * 12  # Each entry is 12 bytes (3 integers)
-            entry_data = self.value[offset:offset + 12]
+            offset = index * 6  # Each entry is 6 bytes (1 integer, 2 bytes)
+            entry_data = self.value[offset:offset + 6]
             id_val, inter_val, cmd_val = struct.unpack('!IBB', entry_data)
             return {"node_id": id_val, "inter_num": inter_val, "cmd": cmd_val}
         else: