Its gateway is the router that connects the LAN to the Internet and also performs Static NAT. This means that whether we use a router or a firewall appliance to perform Static NAT they'll both follow the same guidelines.Īs the diagram describes we have Workstation No.1, which sends a request to the Internet. The process of the Static NAT translation is the same for every device that supports it (assuming the manufacturer has followed the RFCs). The concept is simple and we're going to see it and analyse it using an example, which is really the best possible approach. So what exactly happens to the packet that enters or exits the Static NAT-enabled device ? Well it's not that complicated once you get the hang of it. So let's get started ! Now would be a good time to fill that cup of yours and reload yourself with your special edible supplies :) This page will deal with the transformations the packets undertake as they pass through the Static NAT device, which is normally a router or firewall appliance. The previous page helped us understand what exactly happens with Static NAT and how it works, and we saw a few examples of how to use it in various network configurations. Posted in Network Address Translation - NAT The diagram below illustrates the way Dynamic NAT works: Dynamic translations have a timeout period after which they are purged from the translation table, thus making them available for other internal hosts. With Dynamic NAT, translations don't exist in the NAT table until the router receives traffic that requires translation. These IPs are taken from a pool of public IP Addresses that have been reserved by our ISP for our public network. With Dynamic NAT, we also map our internal IP Addresses to real public IP Addresses, but the mapping is not static, meaning that for each session our internal hosts communicate with the Internet, their public IP Addresses remain the same, but are likely to change. This public IP Address is mapped to our internal host's IP Address and it is then able to communicate with the rest of the world. While looking at Static NAT, we understood that for every private IP Address that needs access to the Internet we would require one static public IP Address. The way Dynamic NAT differentiates from Static NAT is that where Static NAT provides a one-to-one internal to public static IP mapping, Dynamic NAT does the same but without making the mapping to the public IP static and usually uses a group of available public IPs. Dynamic NAT, like Static NAT, is not that common in smaller networks but you'll find it used within larger corporations with complex networks. Dynamic NAT is the second NAT mode we're going to talk about.
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