I am not that familiar with the Cat 5509, but with the Cat 6500 you would want to make the 5/18 port a dot1q trunk port for each of the vlans you want to monitor, and then execute the set span command.
With the Cat 6500 if you don't make the port a trunk port then it still sees the same packets, but all of the packets are sent without dot1q headers so the sensor won't know what vlan they came from. If you make the port a dot1q trunk port and then turn on the span then the same packets are transmitted with dot1q headers to designate the vlan.
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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...