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Cisco ASA 5500 Series Configuration Guide using the CLI
Chapter 31 Configuring Twice NAT
Configuration Examples for Twice NAT
Figure 31-1 Twice NAT with Different Destination Addresses
Step 1 Add a network object for the inside network:
hostname(config)# object network myInsideNetwork
hostname(config-network-object)# subnet 10.1.2.0 255.255.255.0
Step 2 Add a network object for the DMZ network 1:
hostname(config)# object network DMZnetwork1
hostname(config-network-object)# subnet 209.165.201.0 255.255.255.224
Step 3 Add a network object for the PAT address:
hostname(config)# object network PATaddress1
hostname(config-network-object)# host 209.165.202.129
Step 4 Configure the first twice NAT rule:
hostname(config)# nat (inside,dmz) source dynamic myInsideNetwork PATaddress1 destination
static DMZnetwork1 DMZnetwork1
Because you do not want to translate the destination address, you need to configure identity NAT for it
by specifying the same address for the real and mapped destination addresses.
By default, the NAT rule is added to the end of section 1 of the NAT table, See the “Configuring Dynamic
PAT (Hide)” section on page 31-8 for more information about specifying the section and line number for
the NAT rule.
Step 5 Add a network object for the DMZ network 2:
hostname(config)# object network DMZnetwork2
hostname(config-network-object)# subnet 209.165.200.224 255.255.255.224
Step 6 Add a network object for the PAT address:
hostname(config)# object network PATaddress2
Server 1
209.165.201.11
Server 2
209.165.200.225
DMZ
Inside
10.1.2.27
10.1.2.0/24
130039
209.165.201.0/27 209.165.200.224/27
Translation
209.165.202.12910.1.2.27
Translation
209.165.202.13010.1.2.27
Packet
Dest. Address:
209.165.201.11
Packet
Dest. Address:
209.165.200.225