We currently have a SBS 2003 with 2 NICs - one LAN side, one WAN. The SBS has an ISA Firewall. We are replacing this server with new hardware and SBS 2011, in the near future.
As part of this change, I am putting in a Fortigate firewall. I would like to have this in place before the change of server. The firewall will replace the SBS as the gateway.
In simplistic terms: once the Fortigate is set up on the LAN, does anyone see any problems if I simply disable the ISA firewall, and point everything (including the SBS) to the new gateway?
Could the 'public' NIC on the SBS 2003 be utilised in any other way in the short term (perhaps some form of load balancing), or should I just disable it?