Ch27-Network Address Translation Flashcards
An RFC-standard tool for global IP address range assignment. Reduces the size of Internet routers’ IP routing tables.
CIDR (Classless Inter-domain Routing)
For packets sent to and from a host that resides inside the trusted part of a network that uses NAT, a term referring to the IP address used in the headers of those packets when those packets traverse the global (public) internet
Inside global
For packets sent to and from a host that resides inside the trusted part of a network that uses NAT, a term referring to the IP address used in the headers of those packets when those packets traverse the enterprise (private) network
Inside local
Another term for Port Address Translation (PAT). On of several methods of configuring NAT, in this case translating TCP and UDP flows baed on port numbers in addition to using one (or only a few) inside global addresses.
NAT overload
With source NAT, the one address used by the host that resides outside the enterprise, which NAT does not change.
Outside global
A NAT feature in which one inside global IP address supports over 65000 concurrent TCP and UDP connections
PAT (Port Address Translation, NAT Overload
Any of the the IPv4 Class A, B, or C networks that are set aside for use inside private organizations. These addresses are not routable through the Internet
private IP network
The type of Network Address Translation used most commonly in networks in which the source IP address of packets entering the inside interface is translated
source NAT
Command reference: Interface subcommand to enable NAT and identify whether the interface is in the inside or outside of the network
ip nat [inside | outside]
Command reference: Global command that enables NAT globally, referencing an ACL that defines which source addresses to NAT, and the interface or pool from which to find global addresses
ip nat inside source acl [interface int-id | pool pool-name]
Command reference: Global command to define a pool of NAT addresses
ip nat pool pool-name start-ip end-ip [netmask mask | prefix-length prefix-length]
Command reference: Lists counters for packets and NAT table entries, as well as basic configuration information
show ip nat statistics
Command reference: Displays the NAT table
show ip nat translations
Command reference: Clears all of the dynamic entries in the NAT table
clear ip nat translation *
Command reference: Issues log messages describing packets whose IP address is translated with NAT
debug ip nat
Based on the figure, what will the translated address be once the NAT router forwards the packet? Assume no NAT-translated packets have left the router yet. Also, what terminology would apply to this address?
200.1.1.1, inside global
