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Forum Discussion
I have this error "TFTP block rollover. Upload might fail!"
I have this error.
"TFTP block rollover. Upload might fail!"
By default, file transfers using TFTP are limited to 65535 * 512 bytes (almost 32 MiB). Uploading files exceeding this limit might fail, depending on the device. If it does fail, your only option is flashing an older image, which is smaller than 32 MiB.
The first firmware 1.0.1.4 is 36.4 MB in size. How can I solve this?
3 Replies
What model router is this?
Try loading the very first FW version file?
Try nmrpflash:
https://github.com/jclehner/nmrpflashI've never gotten that error with tftp.
what router do you have?
Why are you trying to using tftp on it?
Whats it doing?
Wikipedia seems to think that the 32MB limit for TFTP was raised to 4GB in 1998.
https://en.wikipedia.org/wiki/Trivial_File_Transfer_Protocol
The original protocol has a transfer file size limit of 512 bytes/block x 65535 blocks = 32 MB. In 1998 this limit was extended to 65535 bytes/block x 65535 blocks = 4 GB by TFTP Blocksize Option RFC 2348. If the defined blocksize produces an IP packet size that exceeds the minimum MTU at any point of the network path, IP fragmentation and reassembly will occur not only adding more overhead[8] but also leading to total transfer failure when the minimalist IP stack implementation in a host's BOOTP or PXE ROM does not (or fails to properly) implement IP fragmentation and reassembly.[9] If TFTP packets should be kept within the standard Ethernet MTU (1500), the blocksize value is calculated as 1500 minus headers of TFTP (4 bytes), UDP (8 bytes) and IP (20 bytes) = 1468 bytes/block, this gives a limit of 1468 bytes/block x 65535 blocks = 92 MB. Today most servers and clients support block number roll-over (block counter going back to 0 or 1[10] after 65535) which gives an essentially unlimited transfer file size.
