I always recommend offloading the IPsec from the routers or at a minimum use the available encryption modules. Its very taxing on a router to process these tunnels so a stand-alone device is definitely a better alternative. The concentrators are excellent, fast & reliable. If the remote sites are small enough or there are budget considerations, you can start with terminating the remote site routers to the concentrator at headquarters.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...