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    Understanding IPv6 Support for the TFTP ALG

    Trivial File Transfer Protocol (TFTP) Application Layer Gateway (ALG) has been enhanced to support IPv6 and IPv4 TFTP conversation, which has IPv6 and IPv4 addresses for both the source IP address and destination IP address.

    TFTP ALG processes packets that initiate the routing request and create pinholes to allow return packets from the reverse direction to the port that sent the request.

    The data session is set up by the first packet from the client to the server. TFTP ALG monitors the first packet and opens a pinhole from any port on the server to the client. This process helps the return packets from the server and subsequent data packets to pass through.

    Modified: 2017-10-30