GRE IPSEC and Loopback interface

Discussion in 'Cisco' started by Paul D, May 25, 2004.

  1. Paul D

    Paul D Guest

    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!
    Paul D, May 25, 2004
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