[Bug 1476175] [NEW] Missing rollover breaks windows PXE booting.

[Andres Rodriguez]

Public bug reported:

[Impact]
The implementation of rollover allows transfers to reset the block number counter back to 0 after reaching 2^16, allowing to transfer files of any size. This is particularly useful when grabbing large files. This prevents MAAS from successfully installing windows based OS's.

[Test Case]
1. Install MAAS
2. Upload aa windows image.
3. Deploy windows with traidtional installer.
4. Without the fix, windows will fail to deploy.
5. With the fix, windows will deploy correctly.

[Regression Potential]
Minimal, this has been tested in various different environments and QA'd.

** Affects: python-tx-tftp (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: python-tx-tftp (Ubuntu Trusty)
     Importance: Critical
         Status: New

** Also affects: python-tx-tftp (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Changed in: python-tx-tftp (Ubuntu)
       Status: New => Fix Released

** Changed in: python-tx-tftp (Ubuntu Trusty)
   Importance: Undecided => Critical

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https://bugs.launchpad.net/bugs/1476175

Title:
  Missing rollover breaks windows PXE booting.

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