Linda Dunbar <[email protected]> wrote:
    > When you said “IPs are sourced loopbacks that are part of a prefix
    > exported to the the isp(s) in each site”, do you mean that the private
    > Loopback addresses of CPE1 & CPE2 are routable in all four ISPs’ that
    > connected to A1, A2, B1, B2?

No, he is saying that the CPE1 and CPE2 are each using provider independent
address space and are multihomed to ISP1/ISP2 and ISP3/ISP4 respectively.

If the *private* addresss space of CPE1/CPE2 were visible to the ISPs,
then it wouldn't really be a V*Private*N.  Such things are common in MPLS,
ATM, FrameRelay, and the newer L3VPN technologies that are sold as managed
solutions.

You need four IPsec SAs.  They could be transport+GRE/IPIP tunnels rather
than IPsec Tunnel model SAs with a routing protocol on-top though.

--
Michael Richardson <[email protected]>, Sandelman Software Works
 -= IPv6 IoT consulting =-



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