Which keyword in a NAT configuration enables the use of one outside IP address for multiple inside hosts?
By adding the keyword overload at the end of a NAT statement, NAT becomes PAT (Port Address Translation)
This is also a kind of dynamic NAT that maps multiple private IP addresses to a single public IP address (many-to-one) by using different ports.
Static NAT and Dynamic NAT both require a one-to-one mapping from the inside local to the inside global address.
By using PAT, you can have thousands of users connect to the Internet using only one real global IP address.
PAT is the technology that helps us not run out of public IP address on the Internet.
This is the most popular type of NAT.
An example of using overload keyword is shown below: R1(config)# ip nat inside source list 1 interface ethernet1 overload.
The keyword in a NAT (Network Address Translation) configuration that enables the use of one outside IP address for multiple inside hosts is "overload."
NAT is a method of remapping IP addresses and port numbers used by hosts on a private network to one or more public IP addresses that are visible on the Internet. NAT allows a single device, such as a router, to act as an agent between the Internet (public network) and a local network (private network) by converting private IP addresses to public IP addresses and vice versa.
"Overload" or "PAT" (Port Address Translation) is a type of NAT that allows multiple devices on a private network to share a single public IP address. In "overload" NAT, the router keeps track of the source port number of each outgoing packet and assigns a unique source port number to each internal device. This allows multiple devices to share the same public IP address because the router can identify each internal device based on its unique source port number.
When an incoming packet arrives at the router, the router uses the destination port number to identify which internal device the packet should be forwarded to. The router then changes the destination IP address of the packet to the internal IP address of the selected device and changes the destination port number to the unique source port number assigned by the router. The router then forwards the packet to the selected device on the private network.
In summary, "overload" NAT allows multiple internal devices to share a single public IP address by using unique source port numbers to identify each device.