As i understand it right, the tunnel is not ended on router. Than you just have to allow L2TP (ip protocol 115) to pass you router. So you have to modify your access list on out interface for inbound traffic like this : in global configuration mode "access-list number/name permit 115 source_address complementary_mask destinatination_address complementary_mask" and in interface conf mode "ip access-group number/name in". Now is your L2TP traffic passing your firewall.
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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...