If I switched to routed mode, is there a way to achieve what I mentioned in my original post? From what I have read it seems like transparent mode would be my best choice, unfortunately I need to utilize three ports so this is not an option.
I thought about setting an IP address on the ASA Ethernet Ports 0/0-0/2 each having its own /30 subnet mask but this seems like a waste of addresses.
I resolved the ASDM problem, I had an error in the ACL controlling ip traffic.
Routed mode won't help if the devices are in the same subnet. However, if the devices can all be made to have different subnets then it could work as you'd have a normal firewall scenario inspecting traffic between 3 networks.
I have a solution, which may help. In transparent mode,connect two hosts to a switch , then connect the switch to the firewall, and connect the third host to the other interface of the forewall. in your case only transparent mode can be used.
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...