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How to avoid double NAT with second router?

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I have FIOS service with the Verizon-supplied Westell 9100EM as my primary router.  I currently have a Cisco RV180W connected to a LAN port in the Westell.  All of my home computers and other ethernet devices connect to the Cisco router.  Equipment connected to either LAN / subnet has full internet access.  I am trying to use Cisco's QuickVPN client to establish a VPN connection from remote locations to my home LAN (via the VPN functionality on the Cisco router).  I cannot get this to work and Cisco tells me it is because QuickVPN will never work if the Cisco router's WAN interface has a non-routable IP address (ie, is double NAT'ed).  That is indeed the situation for me.  So I am trying to figure out what options I have to try and make this work.  The two things I think may be worth trying:  bridging or putting the Cisco router into the Westell's DMZ.  Does anyone have experience with similar issue / resolution, using one of these approaches (and guidance regarding the steps to make it work)?  Or any other ideas?

 

Thanks,

Adam


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