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TFTP Message Types

Following table lists five message types in TFTP.

Messsage Opcode Message Type Description
1 RRQ (Read Request) The TFTP RRQ (Read Request) message type is used by the client to establish a TFTP connection for reading file from the server.
2 WRQ (Write Request) The TFTP WRQ (Write Request) message type is used by the client to establish a TFTP connection for writting file to the server.
3 DATA The TFTP DATA message is a block of data.
4 ACK (Acknowledgment) The TFTP ACK (Acknowledgment) message type is used to acknowledge the receipt of a data block.
5 ERROR The TFTP ERROR message type is used to notify a problem during data transmission or when a TFTP connection cannot be established.

Related Tutorials
What is TFTP (Trivial File Transfer Protocol)
Important RFCs related with TFTP
Difference Between FTP and TFTP
TFTP RRQ (Read Request) packet
TFTP WRQ (Write Request) packet
TFTP Data Packet
TFTP ACK (Acknowledge) Packet
TFTP Error Packet
TFTP Client and TFTP Server
How TFTP works