==========================================================Ubuntu Security Notice USN-661-1 October 30, 2008
A security issue affects the following Ubuntu releases:
This advisory also applies to the corresponding versions of
Kubuntu, Edubuntu, and Xubuntu.
The problem can be corrected by upgrading your system to the
following package versions:
After a standard system upgrade you need to reboot your computer to
effect the necessary changes.
Version 2.6.27 of the Linux kernel changed the order of options in
TCP headers. While this change was RFC-compliant, it was found that
some old routers and consumer DSL modems would not route traffic for
these systems when TCP timestamps were enabled. As a workaround, TCP
timestamps were disabled via sysctl.
This update restores the previous ordering of TCP options, and
reenables TCP timestamps. We apologize for the inconvenience.