I will preface this with the fact that I know that the network needs to be redesigned. This is not my animal, I have just walked into a disaster. Re-design is not possible at this point, but some secutity is needed.
The network is composed of 2 X 6509's that are connected together, as well as cross connected to 2 X 4006's. The 6509's run VLAN2 with 5 secondary addresses on the vlan interface. The 4006's run VLAN3 that also have multiple secondary addresses. I need to be able to secure the traffic that flows between VLAN2 and VLAN3.
The FWSM will not support multiple addresses on the VLAN interface. (multinetting)
I figure that if I run the FWSM in transparent mode I can configure the port to the 4006's as 1 side of the transparent interface and another port in VLAN2 as the other interface.
Thoughts? (Network engineers should know better than to do something like what has been done to this company!!!!)