NAT Flashcards
What is source NAT?
When the source address is translated to another address as part of the initial translation.
What is Destination NAT?
When the destination address is translated to another address as part of the initial translation.
What is Static NAT?
A hard coded translation of one address to another in the router
What is Dynamic NAT?
When a range of addresses is translated on the fly by the router for a pre-defined pool of available translation addresses.
What are the differences between inside local, inside global, outside local, and outside global addresses?
Inside local: The actual private IP address assigned to a device on the inside network(s).
Inside global: The public IP address that represents one or more inside local IP addresses to the outside.
Outside local: The IP address of an outside host as it appears to the inside network. The IP address does not have to be reachable by the outside but is considered private and must be reachable by the inside network.
Outside global: The public IP address assigned to a host on the outside network. This IP address must be reachable by the outside network.
What is PAT?
Port Address Translation aka NAT overload. When many addresses are translated to a single address. This uses the private address and the port number to map to the global address with a port number in the translation table.
When configuring a destination NAT (from the outside to the inside), what option might you need to add to ensure the router creates a 32 bit entry in the routing table?
add-route
example ip nat outside source tcp 199.10.10.1 80 10.1.1.10 6777 add-route
