NAT Proxy Servers
Becoming popular; replacing firewalls
Slow down message transfer
Require at least two separate DNS servers
- For use by external users on Internet
- For use by internal users (internal DNS server)
Use of combined, layered approach
- Use layers of NAT proxy servers, packet filters and application gateways
- Maintaining online resources (for public access) in a “DMZ network” between the internal networks and the Internet