[SOLVED] Retry count exceeded; starting again

I want to download image file from my host tftp server to my board. The image file's size is approximately 60MB. And the I encounter the following problem.

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Retry count exceeded; starting again

It's OK when transfer smaller file from tftp server.
It worked fine in Fedora 12 and now I upgrade my OS to Fedora 15.
Any other suggestions?

TFTP is, obviously, trivial. It uses UDP, so no protocol error correction. It's OK for the tiny files it was designed for, but not much more. For larger transfers you need to use FTP, sftp/scp or rsync.

I thought it was the problem of NIC driver of Fedora 15.
Now I had rolled back to Fedora 12 and it works OK as before.
Thanks for your reply, Regards!