Nat Cheat Sheet
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1Address Types
4 simple steps to NAT
NAT Keywords
IP address Pool used in inside global
Inside Local
actual address assigned to an inside host
Define inside and outside interfaces
NAT Pool
or outside local addresses for
translations
Inside Global
Inside address seen from the outside
Define inside ACL (if required)
Pool
This is the name of pool. We can
Outside Local
Actual address assigned to an outside host
Define outside pool (if required)
Name
choose any descriptive name here.
Start IP
First IP address from the IP range
Start NAT
Outside Global
Outside address seen from the inside
Address
which is available for translation.
End IP
Last IP address from the IP range
Troubleshooting and Verification
NAT
Address
which is available for translation
show ip nat translations
Subnet
Show run | include nat
Subnet mask of IP range.
Mask
show ip nat statistics
Maps many Private IP addresses to a
Overload
clear ip nat translations
single IP address using ports
Static NAT
Dynamic NAT
NAT Overload
Dynamic NAT
Static NAT
NAT Overload (PAT)
One-to-one mapping between local and global
Many-to-one (one real Internet IP to many internal,
Mapping from a global pool (Multiple Global IPs)
addresses
Port Address Translation)
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