NAT Virtual Interface

From: Kim (support@isolvesystems.com)
Date: Fri Jun 01 2007 - 10:45:32 ART


Below is the example taken from DocCD. Can someone explain the logic of NVI
or point me to more info? What is the "ip vrf forwarding" under the
interface for?

Enabling NAT Virtual Interface: Example

The following example shows how to configure NAT virtual interfaces without
the use of inside or outside source addresses.

interface Ethernet0/0

  ip vrf forwarding bank

  ip address 192.168.122.1 255.255.255.0

  ip nat enable

 !

 interface Ethernet1/0

  ip vrf forwarding park

  ip address 192.168.122.1 255.255.255.0

  ip nat enable

 !

 interface Serial2/0

  ip vrf forwarding services

  ip address 192.168.123.2 255.255.255.0

 ip nat enable

 !

 ip nat pool NAT 192.168.25.20 192.168.25.30 netmask 255.255.255.0 add-route

 ip nat source list 1 pool NAT vrf bank overload

 ip nat source list 1 pool NAT vrf park overload

 ip nat source static 192.168.123.1 192.168.125.10 vrf services

 !

 access-list 1 permit 192.168.122.20

 access-list 1 permit 192.168.122.0 0.0.0.255

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