Yes, From what I've read (in bits and pieces), Reflexive ACL's suffer from a number of performance issues. While routers with ACL's (or even better,a router with the firewall feature set) will protect your network to a great degree, I feel a firewall is a must if you are thinking about a strong, long-term security solution.
Thanks for the post. While I know reflexive ACL's will be slower, I still think they are better protection than just regular ACLs. An example is that they will not allow connections started from the outside.
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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...