Can I route a block of IP's using ISA550? I have a extra ISA550 and wanted to find a use for it. I need to route a block of Public IP's and would like some firewall protection. If i enter one of the IPs into the WAN1 connection and turn on routing, can I enter a VLAN with the same subnet?
You cannot use the same subnet on the LAN and WAN. What you can do is Static NAT, also known as One-to-One NAT. This allows you to translate a block of public IPs to private IPs so that all traffic passes through the firewall but the transition is seamless. Anyone connecting from the outside would never know that the server has a private IP.
you wan addresses to be natted to hosts (all ports, or you can limit to access lists)
I was thinking you could set your dmz network on the same network or a routed network from the WAN, but have not found an example for that config. I have seen this done on a rv042 (which will also do bridge mode).
What is the application you are using?
by the way, NAT isn't really protection, it's more like obscurity. The firewall in the device is what blocks malicious or unwanted traffic.
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