FortiGate 100D PPTP GRE Requirement

I was wondering if the FortiGate 100D requires the GRE protocol for PPTP VPN connections.  

I have a client with a Netgear WPN824 router and his PPTP connection will connect but drop within 30 seconds.  I don't believe this router supports GRE so I was wondering if there is a way to not force GRE on the FortiGate so this client is able to maintain his connection.  Or would the only option be to change out his router to something that does support GRE?  

Any information is appreciated.
ColumbiaMarketingAsked:
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Garry GlendownConsulting and Network/Security SpecialistCommented:
Not sure about the GRE required question, but with PPTP being most likely the least secure VPN protocol currently available due to several possible attack vectors (and even M$ as its inventor turning away from it), you may want to think about using a "decent" IPSEC tunnel between your sites ...
Also I tried finding infos on the router's VPN capabilities and couldn't even find references to PPTP (apart from pass-through) ...
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ColumbiaMarketingAuthor Commented:
That's pretty much what my assumptions were as well.  Thanks for your input.
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Garry GlendownConsulting and Network/Security SpecialistCommented:
Depending on the speed of the remote site's line and features required, why not just pick up a smaller model (30D, 40C), possibly without bundle if content filtering is not required to keep the price low. They'll do nicely as a gateway, and you'll have a homogenous environment and only one type of OS to administer ...
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