Basically yes. Each line in your ACL actually builds a separate tunnel, with unique SPI's. If you use manual keys, you can only provide one set of SPI's, and therefore, the router/firewall can only build one tunnel, hence only one line in your ACL.
With IKE, it dynamically creates unique SPI's per tunnel/ACL line, and therefore you're not limited.
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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...