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GRE IPSEC and Loopback interface

Paul D
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Dear all

Please excuse my ignorance, but I've been struggling for about 2 months now
with configuring GRE over IPSEC using a Loopback interface as the source of
the tunnel.

I wish to tunnel all internal traffic (including communication generated by
the routers) over the internet between our HQ and a remote office. I wish
to encrypt all communication that passes over the public network, and hide
all internal IP addresses.

Our remote LAN uses the subnet, and the HQ (being the "hub"
where all networks join) can route to all other networks.
We also have multiple available public IP addresses on both sides.

The following configuration closely matches what I am trying to achieve...

....except that, it's not clear to me which interfaces would need public IPs
in our scenario.

I think the ethernet interfaces ( are equivalent to our
Internet interfaces. However, would the & and & IP addresses need to be public or private?

Also, if I wished to use static routes initially, what would be the best way
(in terms of next hop or outgoing interface) to point the HQ router (router
"Light") to networks, and

I'd be indebted to you (almost) forever if you can assist!

Thank you kindly!

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