It will be more difficult and painful to support both IPIP and OpenVPN.
Since this is a new installation, requiring the users to use OpenVPN or equivalent software is probably a better idea. IPIP is a legacy protocol, not secure, and not easy to administrate. You should not use it if you don't absolutely have to.
If you *do* have to use IPIP, you should talk to someone who is already doing this. I think PE1CHL Rob may be able to offer advice, if he has time. I suspect you will have to build your own tools to manage the IPIP configuration at the server.
OpenVPN will deal with dynamic client addresses.
Since each home gateway will get a small piece of the subnet, routing is automatic and handled by the OpenVPN server.
There is other VPN server software than OpenVPN. Perhaps you would prefer one of them. - Brian
On Thu, Feb 21, 2019 at 03:27:21PM +0000, R P via 44Net wrote:
Thank U Brian What system in the data center will deal the problem of the end users gateways that uses Dynamic IP that do IPIP to it ? (like UCSD deal with it today )and spread the updated routing tables ?
Part of the users probably use VPN and with that the IP address change is not a problem but part of them also will use IPIP ...