CSKH-02.2018 - (Abstract) - The Layer 2 network security has shown many advantages compared to Layer 3. However, the structure of Layer 2 does not indicate the size of data packet, it makes the difficult to capture the data packet, especially in the case the packet is captured by hardware. Also, there are limitation of using software to capture the packet. In addition, when the size of the packet is not defined, it will be difficult to handle the packet with inserting cryptographic parameters that exceed the permissible length. In this paper, a technical solution for capturing Ethernet packet directly from FPGA is presented, organising data to ensure transparent communication capability to implement Layer 2 packet security, to overcome the limitations when capturing packet by using software.