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Firewall question/NAT

S

stuman19

Senior member
I'm doing a research paper on Firewalls and I have it pretty well nailed down, but I just have a few questions that I can't seem to find the answers to that I though you guys might be able to help on. What types of firewall technologies can you setup NAT on? I know that proxy servers are one of them. Is NAT setup through a Network Layer Firewall such as a router or is it strictly at the Application Level such as a proxy server? Any input would be greatly apprectiated! Thanks fellas!

Stu
 
NAT is an IP-layer technology that basically just rewrites IP addresses in packet headers. There are two basic types of NAT: Static and Dynamic. There are also two subsets of Static NAT: Source NAT (where the Source IP is rewritten) and Destination NAT (where the Destination IP is rewritten). Suse has a good page on NAT, as do several others.

On the OSI model, it falls on layer 3.
 
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