moving EC2 instances behind pfsense fierwall

We have 4 x EC2 instances...  2 x are for VPN service.. This being one for site to site tunnels and the other for client access VPNs.  The other two EC2 instances are for the production web app and the dev web app...  Now..  We plan on replacing the two VPN EC2 instances with a single pfsense firewall.  It will handle the routing, NAT'ing, site to site tunnels, and client access VPNs..  I'll end up with 3 x EC2 instances total.  The pfsense firewall, production web app, and dev web app.  Since the pfsense firewall will be handling the routing, site to site tunnels, NAT'ing, and client access VPNs I'll be obviously making changes to the current VPC.  Am I better off creating a new VPN and moving these EC2 instances into it?  Or.. Just modifying the existing VPC?
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I would add a new EC2 instance to the existing and setup pfsense on it, then move the traffic

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gopher_49Author Commented:
I just learned that the pfsense instance has a VPC wizard to link to your existing VPC.  Question.  Why do these instances have DHCP enabled NICs?  Can't I simply make them static now and point to my new pfsense Gateway or will it still use the current VPC Gateway?
It sounds as if one of the other instances might be running a DHCP server.

I can't really comment on the "why"...
gopher_49Author Commented:
The VPC is the DHCP server...  The whole thing is this... How do devs think this is a good idea?  Port forwards and access in general will have issues once the instance's IP changes...  Maybe the VPC keeps the lease forever..
gopher_49Author Commented:
We ended up using the VPC wizard to configure the existing VPC for it didn’t have a VPN or use any of the APIs the Netgate VPC wizard used
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