It looks like your client is using L2TP directly instead of using L2tp-over-IPsec. On asa, you can check the ipsec status by "show crypto isa sa" and "show crypto ipsec sa". If there is no any output, it indicates that your client did not initiate IPSec at all. You need check your client's configuration.
Yes, I am not getting any output from either of those two show commands, which made me realize that the client was not getting anywhere! However, when I look at the Real-Time ASA log, it shows that the ASA Outside interface is discarding the packets coming from the client on UDP port 1701. That would suggest that the client is initiating the IPSec tunnel, but it isn't being processed by the ASA. The XP client screen indicates that I have "L2TP IPSec VPN" selected. Is there another way to verify that the client is really sending L2TP-Over-IPSec?
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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...