You can easily give it a try and keep it if you like it! Publisher's description

Thus if you are looking for tools to ease your administrative burden of all those switches, routers and the client machines in a large network, this is a handy tool. One of the greatest feature, besides an easy interface is that it is free to use. The software runs as a service and thus is available all the time in the background easing your operations. Security management is through specifying particular IP addresses as well as ranges of addresses for transfers. Being multi-threaded, the software application makes the job quite fast. Transfers of 4 GB files are handled easily by the tool. This will make managing multi vendor network easy too. When maintenance calls for back up of firmware of devices like switches and routers, this server can come in handy. Upgrade of IOS images and firmware on network device. It is a easy-to-use free TFTP solution that meets that use scenario. It finds its use commonly to upload and download executable images and back up configurations for routers and switches. TFTP thus should be used in a reliable communication medium such as a LAN configuration. This does not guarantee reliable delivery. TFTP or the trivial file transfer protocol is a simplified version of the FTP and uses UDP packets. Typically such servers are used for upload or download of software images. SolarWinds free TFTP Server is a multi-threaded TFTP server. This is a TFTP server that can upload/download software images easily.

Download solarwinds tftp software