Performance and flexibility.  OpenVPN is good at getting unicast IP traffic 
from A to B, but it's difficult to, say, run OSPF over it.  It also need 
ridiculous amounts of CPU time to encrypt, especially painful in situations 
that don't need encryption.
So, yeah, there are a LOT of use cases where GRE is the better choice.
-Adam

On March 30, 2015 6:20:26 AM CDT, Kevin Tollison <[email protected]> wrote:
>Would OpenVPN not be a better solution?
>
>Any constraints limiting you to GRE?
>
>On Mon, Mar 30, 2015, 6:09 AM Abid khan <[email protected]> wrote:
>
>> Hi,
>>
>> I am trying to implement a GRE tunnel over 2 publc WAN addresses,
>> unfortunalty i cannot find a guide /howto- for the same.
>>
>> can someone please point me to a guide which i can replicate. thanks
>>
>> rgds
>> Abid
>>
>>
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