When does a connection become "established"? For instance, if I have an access list which allows any TCP port to come "in" to a serial interface if the connection is established, are there any gotcha's associated with that? I tried an access list like this but could not make any DNS requests (or so it seemed).
access-list 101 permit tcp any host 220.127.116.11 established
Established statements in ACL have no effect with DNS (UDP 53). Host DNS query uses UDP and not a TCP protocol. Since UDP is a connectionless protocol, in your case the return DNS response UDP packet gets denied by your accelss-list. Established parameter checks and permits/denies incoming TCP packets that have RST or ACK bit set.
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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...