I am looking at a solution for a client who currently uses a BT 2 wire router with a single ip address, there is another customer in the building now expanding and wanting to use their own mail server.
When i configure a BT 2 wire for multi ip address you have to do this via address allocation and this makes the router transparent, i would like to know if the cisco can hadle 5 ip addresses from BT and if i can use basic routing as:
ip nat inside source static tcp <local> 25 <public ip> 25 route-map SDM_RMAP_1 extendable
You may ask why i dont just use the BT box, but the client does some work for the other tenent in the building so i will have to configure vlans with access between them.
Any advice before i commit to a solution would be great.