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Understanding how TFTP works within the scope of a given network environment is central for professionals within the IT industry to grasp. TFTP remotely boots computers for purposes of network monitoring using special software designed to accomplish the task.

Important TFTP Definitions

TFTP and RTT are 2 acronyms of importance to know before digging deeper into understanding and installing TFTP.

TFTP (Trivial File Transfer Protocol Defined: TFTP utilizes a lock-step algorithm to produce its file transfer protocol results. Though similar to FTP there are significant differences between TFTP and FTP. Both protocols transmit data in block packets while relying on RTT to communicate the server readiness for the next block to be transmitted.

Round-Trip Delay (RTT) Defined: The time it takes to travel from a given source and back to the original target with a signal, pulse or packet.

How to TFTP

TFTP processes work like this: Let’s say that RTT between 2 items is 20 ms; in such a case a transmitter would be able to send 50 blocks per second. With a default block size of 512 bytes, the transfer rate is then limited to 25 kb.

By using larger blocks such as 1024 or 1468 bytes, the transfer speed will increase significantly. The most commonly-used transfer speed is 1468 bytes. Exceeding 1500 bytes Ethernet MTU with the size of data payload and protocol headers combined is not possible.

A transfer window is used with the TFTP protocol even though it is standardized as “lock-step”. New packets are transmitted by the file “transmitter” before the receipt previous packets has been fully acknowledged. In so doing a transfer window is able to process a variety of packets simultaneously. This makes it much more convenient for users to send out multiple files without having to wait for confirmation.

So How Do I Install a TFTP Download?
Once you find the right TFTP download for your IT department, here is what typically happens during installation:

• The initiating host will send a request packet to host at port 69 which contains file name and transfer mode.
• The hose receiving the transfer sends a reply of acknowledgment to the originating host.
• If acknowledgment isn’t received, a retransmit timer automatically resends the data.
• Once the connection is established the originating host begins to send numbered packets to the destination host minus the final packet which is delivered as a full-sized 512 byte data block.
• The destination host replies with individually-numbered acknowledgment packets.
• When it is time for the final data packet to be sent it needs to hold less than a full-sized block in-order to communicate that it is the final packet to be sent.
• The originating host will send a final packet containing 0 bytes of data if the final packet received from the receiving host is an exact multiple of the block size being transmitted.
• Receiver responds to every data package with associated numbered acknowledgment.
• The originating host continues to transmit additional blocks of data as it receives acknowledgment packages from the receiving host.

This is the process used for TFTP technology to communicate with remote computers that need to be monitored on a company’s network and why it is important for IT professionals to understand.

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