# Define TFTP Protocol parameters

The Trivial File Transfer Protocol (TFTP) Protocol Agent transfers data using dynamically assigned ports.

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A TFTP Agent is attached to a UDP connection established between the client and the server. The client opens the control connection from a dynamically selected source port to the fixed destination port 69/UDP on the server. A separate UDP data connection is established between the client and the server after the client has sent a “read” of “write” command to the server. The server opens a data connection from a dynamic source port to the client’s destination port. This port is same as the one used as the source port of the control connection.

The TFTP protocol (RFC 1350) does not limit the port range that can be used. This Protocol Agent is available on Firewalls, IPS engines, and Layer 2 Firewalls. The TFTP Protocol Agent supports NAT operations (Firewall only).

The parameters in this protocol are for firewalls only.

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## Steps

1. In the properties of a custom Service you have created, click Select next to the Protocol field and select TFTP.
2. (Firewall only) On the Protocol Parameters tab, set the parameters for the Protocol.
3. Click OK.