How to handle a block of external IP on a local LAN

I have a Netopia router from ATT and an older netgear prosafe firewall. My local IP scheme is a 10.0.0.x.  Running dhcp, dns and active directory from a 2k3 r2 box.  I have 1 static external ip but need to move to a block to facilitate a security system. Whats the best way to use and manage these IP's without changing my local IP scheme? I assume I am going to need an additional appliance?  

Thanks in advance!
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Todd GerbertIT ConsultantCommented:
What you'll need is a router that wil allow you to configure multiple external IP addresses and configure their public-to-private mappings. If your current Netopia will do that then you shouldn't need any new equipment; otherwise you'll replace the Netopia.
I don't know if any Netopia routers will do this - I do know just any Cisco device will. I have personal experience with both the Cisco ASA security appliances and 800 series wireless routers, both of which work very well for me and aren't too expensive.
If you don't need the block of external IPs to relate to the internal network in any real way (that is you can continue to have the internal network to connect to the internet using a single IP address) then you can just make your current IP on the netgear firewall one of the external IPs and change nothing wlse. If you need to have the external IPs correspond to internal IP addresses as well as keeping most internal devices behind a single IP address then you will need to have a router with more robust Network address translation as tgerbert states.
Jasper_FlAuthor Commented:
Thanks to both responses, I will need to designate some of the external  ip's  to point to a few ip cameras and DVR units. I suppose I could port forward those requests to the internal device ip  assuming the software has the capability to specify which port to use?

Any advice on a low priced router solution that will handle the NAT a bit better?
Cisco ASA 5505 would be perfect and give you many new features, too.
Don't know your parameters for "low priced", but it is generally reasonable for a business expense.
Alternative that I know can use multiple public IP's is Linkys RVOx series RV08.
Jasper_FlAuthor Commented:
THanks for the advice
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