TFTP

The TFTP ALG is implemented as an extension of the NAT ALG. It works slightly differently than traditional NAPT. In a TFTP session, the first packet is sent from a source endpoint to port 69 on the TFTP server. The TFTP server responds from another port. This port, from which the TFTP response originates, is used for the remainder of the TFTP session.

To act as a TFTP ALG, the Oracle® Enterprise Session Border Controller will latch on the first return packet from the server to learn the server's port. The ingress-side destination port of the Oracle® Enterprise Session Border Controller is changed to reflect the new communications port for the TFTP session. This process takes place without any user intervention.