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Logician Tarot
Logician Tarot

Error failed to download image on slot-2 - tftp write error: The difference between copy tftp flash and archive download-sw commands


How to Fix Error Failed to Download Image on Slot-2 - TFTP Write Error




If you are trying to upgrade the firmware or configuration of your network device using Trivial File Transfer Protocol (TFTP), you may encounter an error message that says "Error: Failed to download image - tftp: write error". This error means that the file transfer was interrupted or failed due to some reason. In this article, we will explain what TFTP is, why it is used for file transfers, what causes the TFTP write error, and how to fix it.


What is TFTP and why it is used for file transfers




TFTP stands for Trivial File Transfer Protocol, which is a simple and lightweight protocol that allows a client to get a file from or put a file onto a remote host. One of its primary uses is in the early stages of booting from a local area network, when the client device has limited resources and capabilities. TFTP can also be used to transfer firmware images and configuration files to network devices such as routers, switches, firewalls, IP phones, etc.




error failed to download image on slot-2 - tftp write error



The basics of TFTP protocol




TFTP uses User Datagram Protocol (UDP) as its transport layer protocol, which means that it does not guarantee reliable delivery of packets or error detection and correction. TFTP relies on acknowledgments and timeouts to ensure that the file transfer is completed successfully. Each block of data, which is usually 512 bytes by default, must be acknowledged by the receiver before the sender can send the next block. If the sender does not receive an acknowledgment within a certain time, it will retransmit the block until it receives an acknowledgment or reaches a maximum number of retries.


The advantages and disadvantages of TFTP




The main advantage of TFTP is its simplicity and ease of implementation. It does not require any authentication, encryption, or complex features that other file transfer protocols have. It can work well in low-bandwidth or high-latency environments where reliability is not critical. It can also handle multiple concurrent file transfers without consuming too much memory or CPU resources.


The main disadvantage of TFTP is its lack of security and robustness. It does not support any user authentication or encryption, which means that anyone can access or modify the files on the server. It also does not support any directory listing, file deletion, or file renaming operations. It can only read and write files that already exist and are publicly writable on the server. It can also be vulnerable to packet loss, corruption, duplication, or reordering due to UDP's unreliability. It can also suffer from performance issues if the network conditions are poor or if the server is overloaded.


What causes the TFTP write error and how to troubleshoot it




The TFTP write error occurs when the client device fails to upload a file to the server device using TFTP. There are several possible reasons for this error, such as:


  • The network connectivity between the client and the server is unstable or interrupted.



  • The firewall or antivirus software on the client or the server is blocking or interfering with the UDP port 69 (TFTP) or the data ports used by TFTP.



  • The file name, size, extension, or path is incorrect or incompatible with the server device.



  • The file system or permissions on the server device are not configured properly to allow writing files using TFTP.



  • The server device is running out of disk space or memory.



  • The client device is using an incompatible or outdated version of TFTP software.



To fix the TFTP write error, you need to follow these steps:


Steps to fix the TFTP write error




  • Check the network connectivity between the client and the server devices. Make sure that they are on the same subnet and that there are no physical or logical obstacles that may disrupt the communication. You can use ping or traceroute commands to test the connectivity and latency.



  • Check the firewall or antivirus settings on both the client and the server devices. Make sure that they are not blocking or interfering with the UDP port 69 (TFTP) or the data ports used by TFTP. You may need to add an exception or a rule to allow TFTP traffic through the firewall or antivirus software.



  • Check the file name, size, extension, and path that you are trying to upload to the server device. Make sure that they are correct and compatible with the server device. Some devices may have limitations on the file name length, size, extension, or path. You may need to rename, compress, or convert the file before uploading it.



  • Check the file system and permissions on the server device. Make sure that the server device has enough disk space and memory to store the file. Make sure that the file system supports writing files using TFTP. Make sure that the file or folder that you are trying to upload to is publicly writable and accessible by TFTP.



  • Check the version and configuration of the TFTP software on both the client and the server devices. Make sure that they are compatible and up to date. You may need to update or reinstall the TFTP software if it is corrupted or outdated. You may also need to adjust some settings such as timeout, block size, port range, etc.



By following these steps, you should be able to fix the TFTP write error and successfully upload your file to the server device using TFTP.


Conclusion




TFTP is a simple and lightweight protocol that can be used to transfer files between network devices. However, it can also encounter some errors such as the TFTP write error, which prevents the client device from uploading a file to the server device. The TFTP write error can be caused by various factors such as network connectivity, firewall or antivirus settings, file name, size, extension, or path, file system or permissions, or TFTP software version or configuration. To fix this error, you need to troubleshoot these factors and follow some steps to resolve them.


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FAQs




What is the difference between TFTP and FTP?




TFTP and FTP are both protocols that can be used to transfer files over a network. However, they have some differences in terms of features and functionality. FTP stands for File Transfer Protocol, which is a more complex and robust protocol than TFTP. FTP supports user authentication, encryption, directory listing, file deletion, file renaming, resume transfer, etc. FTP uses TCP as its transport layer protocol, which guarantees reliable delivery of packets and error detection and correction. FTP uses two ports: one for control commands (port 21) and one for data transfer (port 20 or any other port).


How to enable TFTP client in Windows 10?




TFTP client is not enabled by default in Windows 10. To enable it, you need to follow these steps:


  • Go to Control Panel > Programs > Turn Windows features on or off.



  • Scroll down and find TFTP Client under Windows Subsystem for Linux.



  • Check the box next to TFTP Client and click OK.



  • Wait for Windows to install the feature and restart your computer if prompted.



After enabling TFTP client in Windows 10, you can use it from Command Prompt or PowerShell by typing tftp followed by the command options.


How to choose a port range for TFTP data transfer?




TFTP uses UDP port 69 as its default port for initiating a file transfer request. However, for each data transfer session, it uses a random port number between 1024 and 65535 as its source port on the client device and as its destination port on the server device. This means that you need to open a wide range of ports on your firewall or antivirus software to allow TFTP data transfer. However, you


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