I have a Cisco ASA 5510 on a Class C (/24) network thats running out of IP addresses. Id like to slowly migrate over to a new network. The current network has several site to site VPN connections that I dont want to disturb. I was thinking of establishing another network on a second spare port to create a larger Class C (/22 1022 addresses) or B network and slowly migrating servers over. I have a spare Domain Controller for the new network but, as I move users over, I want to make sure they will be able to reach the mail and file servers on the original Class C (/24) network. In addition, the site to site VPN connections in the first class C need to be connected to the new network, with continuous traffic until I can retire the old Class C.
A few questions -
1. If my new network is Class C /24, on port 1 of the ASA, will it be able to transfer traffic to my new network (either Class C /22, or Class B) on port 3 of ASA? Can a Class C talk to a Class B?
2. Looking for recommendation on best practices for 500 nodes. Advantages/ Disadvantages for supernetting on Class C (/22, 1022 addresses) or installing Class B.