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NAT - Coggle Diagram
NAT
NAT Configuration and Troubleshooting
Static NAT Configuration
ip nat inside
interface mode
ip nat outside
interface mode
ip nat inside source static
inside-local
inside-global
global mode
Configure ACL
Dynamic NAT Configuration
ip nat inside
interface mode
ip nat outside
interface mode
Configure ACL
ip nat pool
name first-address last-address
netmask
subnet-mask
global mode
ip nat inside source list
acl-number
pool
pool-name
global mode
Dynamic NAT Verification
show ip nat translations
show ip nat statistics
PAT Configuration
[The same configuration as Dynamic NAT]
Instead the last step:
ip nat inside source list
acl-number
interface
type/number
overload
NAT Troubleshooting
Most common source NAT issues
Reversed inside and outside
Static NAT
Dynamic NAT (ACL)
Dynamic NAT (pool)
PAT
ACL
User traffic required
IPv4 traffic required
IPv4 routing
NAT Concepts
Static NAT
One-to-one mapping
inside local
for the private IP addresses
inside global
for the public IP addresses
Dynamic NAT
One-to-one mapping
The dynamic entry stays in the table as long as traffic flows occasionally
It has a pool of directions
Overloading NAT with PAT
Translates not only the address, but the port number
Looks like one host having many flows
PAT can use more than 65,000 port numbers
Perspectives on IPv4 Address Scalability
CIDR
Convention of how to assign the globally unique IPv4 address space to individual organizations
Private Addressing
10.0.0.0 to 10.255.255.255 ------ A----1 network
172.16.0.0 to 172.31.255.255---------B-----16 networks
192.168.0.0 to 192.168.255.255-----------C-------256 networks