If a 'person in the middle' has knowledge of the pre-shared secret used to authenticate a VPN tunnel, using IPSEC/IKE. Could that person potentially decrypt the conversation? Or otherwise use the pre-shared secret to try and duplicate keys?
Pre-shared keys are fine but not scalable. From my knowledge, if the key is compromised, it has to be changed immediately on all devices. A safe way is to sign-up with a CA. This was recommended by Cisco while I was designing our VPN. Well, the answer to your question is "yes, the security and data are compromised".
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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...