Well, I just rebuilt the kernel using 2.6.32.27 and ovs from the 1.7.1 branch 
and I have not been able to recreate the issue.  It could have been the way I 
built the kernel or module, or even the vmxnet3 driver, but it seems OK now.  I 
will keep testing and let you know if I find any other issue.

Thanks for your pointers.

Jeff

On Oct 3, 2012, at 4:24 PM, Jesse Gross <[email protected]> wrote:

> On Wed, Oct 3, 2012 at 3:44 PM, Jeff Welsch <[email protected]> wrote:
>> Here is the relevant output from modinfo:
>> 
>> filename:       ./openvswitch.ko
>> version:        1.8.90
>> license:        GPL
>> description:    Open vSwitch switching datapath
>> srcversion:     D225A9C6E41431DDC6150EB
> 
> But what module is actually loaded - look in dmesg.
> 
> The other possibility is that this isn't actually from GRE
> encapsulation but decapsulation.  Maybe you're trying to forward
> traffic out an interface that does have a lower MTU.

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