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From "Dan Armbrust (JIRA)" <>
Subject [jira] Created: (NET-181) tftp client limited to ~32 MB file sizes
Date Fri, 04 Jan 2008 19:47:35 GMT
tftp client limited to ~32 MB file sizes

                 Key: NET-181
             Project: Commons Net
          Issue Type: Improvement
         Environment: All
            Reporter: Dan Armbrust
            Priority: Minor

I just noticed that the TFTPClient class does not support a block wraparound - hence, when
the block number exceeds the max allowed by the rfc (65535) - about a 32 mb file - bad things
will happen.

I can't find any rfc that specifies how the wraparound is supposed to occur, but this wiki
page mentions it:

And I am working on implementing a TFTPServer - and in my tests with the tftp client that
is shipped with fedora, I have determined that that tftp client expects the next block number
after 65535 to be 0.

So it appears that the TFTPClient should wrap its block number so that it properly supports
larger files.

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