Huawei AR150 series - Example for Configuring Twice NAT

#
interface Ethernet0/0/0
port link-type access
port default vlan 100
#
interface Ethernet0/0/1
port link-type access
port default vlan
200
#
interface Ethernet2/0/0
ip address 202.169.10.1
255.255.255.0
nat outbound 2000 address-group 1 no-pat
nat outbound 2001 address-group 2
#
nat address-group 1 202.169.10.100 202.169.10.200
nat address-group 2 202.169.10.80
202.169.10.83
#
ip route-static 0.0.0.0 0.0.0.0 Ethernet 2/0/0
#
return
5.4.3 Example for Configuring Twice NAT
Networking Requirements
As shown in Figure 5-6, the IP address of PC1 on the private network is the same as the IP
address of host A on the public network. When PC2 sends a packet to host A, the packet may
be forwarded to PC1. In addition to the network address translation function, twice NAT of the
AR150/200 specifies the mapping between the overlapping address pool and the temporary
address pool. The overlapping IP address is translated to a unique temporary address so that
packets can be forwarded correctly.
Figure 5-6 Networking diagram for twice NAT configuration
PC 1
Eth0/0/0
Eth2/0/0
Company B
PC 2
10.0.0.3/24
Eth0/0/1
Company A
192.168.20.2/24
PC 1
Router
Host A
192.168.20.2/24
DNS Server
www.Server.com
202.169.10.2
Huawei AR150&200 Series Enterprise Routers
Configuration Guide - IP Service 5 NAT Configuration
Issue 02 (2012-03-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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