Duplicate First Packet Detected: this basically means that even after the VPN3000 processing and sending back the Phase 1 packet, the client is resending the first packet again and again, thinking that the first packet that it sent did not reach the VPN3000.Typically this is a result of one of the following problems; wrong default gateway on concentrator, Filter out from concentrator blocking ISAKMP, firewall at client or PAT at client blocking ISAKMP or IPSec This indicates that the responses from the concentrator are not getting back to the client. It could also be a problem with the NIC on the client.
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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...