Cisco ASA 5505 Configuration Manual page 557

Chapter 27 Configuring Network Object NAT
Click OK to return to the Edit Network Object dialog box, click OK again, and then click Apply.
Step 4
DNS Server and Web Server on Mapped Interface, Web Server is Translated
(Static NAT with DNS Modification)
Figure 27-67
static translation for the outside server. In this case, when an inside user requests the address for
ftp.cisco.com from the DNS server, the DNS server responds with the real address, 209.165.20.10.
Because you want inside users to use the mapped address for ftp.cisco.com (10.1.2.56) you need to
configure DNS reply modification for the static translation.
Figure 27-67
3
DNS Reply Modification
209.165.201.10
Create a network object for the FTP server address:
Step 1
OL-20339-01
shows a web server and DNS server on the outside. The adaptive security appliance has a
DNS Reply Modification Using Outside NAT
1
DNS Query
ftp.cisco.com?
2
DNS Reply
209.165.201.10
Appliance
10.1.2.56
4
DNS Reply
10.1.2.56
Configuration Examples for Network Object NAT
ftp.cisco.com
209.165.201.10
Static Translation on Inside to:
10.1.2.56
DNS Server
Outside
10.1.2.56
Security
FTP Request
Inside
User
10.1.2.27
Cisco ASA 5500 Series Configuration Guide using ASDM
7
FTP Request
209.165.201.10
6
Dest Addr. Translation
209.165.201.10
5
10.1.2.56
27-35