I am trying to re-design a network for the company I work for but dont quite have the right idea's, so I hope you guys can help me out. Ok... The network currently consists of a single PIX 515 and the ISP border router, I have been asked to enable the network to be ready for a global MPLS network and to connect various internal subnet's together - there are 2 distinct networks currently. I understand that I need a layer 3 device somewhere to do the routing. I was going to use a Cisco layer 3 switch, as all interconnects are either FE@100mbps or some type of RJ-45 presented MPLS WAN link, on the internal LAN sitting between the LAN and the PIX.
I have just realised that the PIX has various entries for different internal hosts allowing certain ports that would quite clearly not work if I put that switch on the inside between it and the internal hosts. I was planning on leaving the internal IP address scheme as is, and re-designing from the switches external interface outwards, therefore altering the PIX's internal IP address.
What a mess, I hope that makes.
Thanks in advance