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Patch is already upstream for quite a while, and is small and contained.  It allows dispatcher scripts to respond to possible changes of DHCP options, which wasn't possible before.

Created attachment 468439 [details]
lease change event patch

This patch is very simple and does not change any existing functionality, it only adds a small bit of *new* functionality.

Upstream fix:

9b54cb1ec617ea8bff86d6d74c06cef5a51e26c9 (master)
ca2dfc0ae7d1d935c6f378ae090d8681190b37a0 (0.8.x)

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
DHCP lease change events now trigger dispatcher scripts at the /etc/NetworkManager/dispatcher.d location.

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2011-0769.html