- Planet WAN Router User's Manual

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5.2 NAT – Network Address Translation
IP address depletion is a main problem that facing in the public network. NAT (network address
translation) is a solution that allows the IP network of an organization to appear from the outside to use
different IP address then it own IP address.
Because the IP address is depletion therefore not all your hosts have global unique IP addresses. NAT
technology is translates the private IP address into public IP address before sending packets to the
outside network. There are two different methods, which is static and dynamic NAT.
ip nat inside source static local-ip golobal-ip – configure static NAT
ip nat [inside | outside] – Enable NAT on at least one and one outside interface by interface command
ip nat pool pool name srat-ip end-ip netmask [prefix-length | type rotary] - Define a pool of global
addresses to be allocated as needed.
Ip nat inside source list access-list no pool pool name [overload]- Establish dynamic source
translation, specifying the access list defined in the prior step. [option] overload, add the overload key
word to the command
Access-list access-list number permit source address [source wildcard bits]
Ip nat inside destination list access-list number pool pool name – Establish dynamic inside
destination translation,
Ip nat outside source list access-list no pool pool name - Establish dynamic outside source
translation, specifying the access list defined in the prior step
Show ip nat translation – display the active translations
Show ip nat statistics – display
Debug ip nat [detailed] – display a line of output for each packet that gets translated.
Clear ip nat translation * - to clear all translated entries.
Clear ip nat translation inside gip lip [outside <gip> <lip>] – clear both of inside or outside translation
Clear ip nat translation outside lip gip – clear outside translation