Need help with network layout puzzle please

[Silencerr]

Hey,

I've posted this in Cisco routers forum before I realized that this might be a better place for this question.

My company is planning to switch the business ADSL ISP in the very near future and the big difference is that we only get 5 static registered IPs when we had 32 before. So now I'm wondering what would be the best approach to deal with this and I would really appreciate some help since I'm no guru in network design at all.

Here (

http://members.shaw.ca/popov/networklayout.gif)

is a quick diagram that represents the requirements (it's wrong design-wise though). As you can see we have:
- two computers that have to have registered IPs
- two groups of other computers that would need only selected services forwarded through defined ports (x.x.x.x represents static registered IPs provided by the ISP). They are combined in two groups to be able to forward a given service to more than one NATed computer.
Obviously as far as my knowledge goes this will work as far as the picture is concerned, however the problem is that basically all these computers are joined together as a domain and they need to be able to communicate with each other without limits, which isn't possible given this diagram (right?).

This is way out of my leage (I'm a developer not a network admin) and I would really appreciate if guys could help me out here. I can always FedEx ya some beer if it all works out

Thank you!

 

[GoLdFiNgeR]

first off that is a terrible picture and i only can make out what are supposed to be computers, secondly, how many a static ip from you isp is only for the outside world, not your internal network, you can stil give them a static ip, or use dhcp to give them a random ip, for your netowrk, then giving away your isp's ip to the computers who need it, generally where i work we only use a isp static ip for telnet and stuff like that