Cisco ASA 5505 - Manual (Page 632)

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Cisco ASA 5500 Series Configuration Guide using the CLI
Chapter 31 Configuring Twice NAT
Configuration Examples for Twice NAT
hostname(config-network-object)# host 209.165.202.130
Step 7 Configure the second twice NAT rule:
hostname(config)# nat (inside,dmz) source dynamic myInsideNetwork PATaddress2 destination
static DMZnetwork2 DMZnetwork2
Different Translation Depending on the Destination Address and Port (Dynamic
PAT)
Figure 31-2 shows the use of source and destination ports. The host on the 10.1.2.0/24 network accesses
a single host for both web services and Telnet services. When the host accesses the server for Telnet
services, the real address is translated to 209.165.202.129:port. When the host accesses the same server
for web services, the real address is translated to 209.165.202.130:port.
Figure 31-2 Twice NAT with Different Destination Ports
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 Telnet/Web server:
hostname(config)# object network TelnetWebServer
hostname(config-network-object)# host 209.165.201.11
Step 3 Add a network object for the PAT address when using Telnet:
hostname(config)# object network PATaddress1
Web and Telnet server:
209.165.201.11
Internet
Inside
Translation
209.165.202.129 10.1.2.27:80
10.1.2.27
10.1.2.0/24
Translation
209.165.202.130 10.1.2.27:23
Web Packet
Dest. Address:
209.165.201.11:80
Telnet Packet
Dest. Address:
209.165.201.11:23
130040