I cannot put a different public IP address because the firewall is connected to the firewall of the building. In the building firewall is already opened the port 1723 and allowing GRE protocol and forwarded to the outside interface ip address of the Cisco (83.244.*.*)
I tried to telnet the ip address on the port 1723 but seems that cannot connect, however, doing a port scanning on that ip address shows the port open.
Also, after deleting the static nat, I executed the clear xlate.
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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...