Configuration Guide Configuring NAT
Global configuration mode
 Configuring the Address Pool
ip nat pool address-pool start-address end-address { netmask mask | prefix-length prefix-length }
address-pool: name of the address pool
start-address: start IP address
end-address: end IP address
netmask mask: network mask of the addresses
prefix-length prefix-length: length of the network mask of the addresses
Global configuration mode
 Configuring Dynamic NAT
ip nat inside source list access-list-number pool address-pool
access-list-number: ACL number
pool address-pool: name of the address pool
Global configuration mode
 Configuring ALG
ip nat translation { dns [ ttl ttl_time ] | ftp [ port port_num ] | tftp | pptp | h323 | rtsp }
ttl: defines the NAT timeout interval of the UDP connection of the DNS application. The default value is
0.
port_num: defines the port number used for the FTP application. The default value is 21.
Global configuration mode
Configuration
Example
 Enabling Intranet Users to Access an Extranet Server
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