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Cisco ASA 5500 Series Configuration Guide using ASDM
OL-20339-01
Chapter 26 Information About NAT
Where to Go Next
Figure 26-19 shows a web server and DNS server on the outside. The adaptive security appliance has a
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 26-19 DNS Reply Modification Using Outside NAT
Where to Go Next
To configure network object NAT, see Chapter 27, “Configuring Network Object NAT.”
To configure twice NAT, see Chapter 28, “Configuring Twice NAT.”
ftp.cisco.com
209.165.201.10
DNS Server
Outside
Inside
User
10.1.2.27
Static Translation on Inside to:
10.1.2.56
130022
1
2
7
6
5
4
3
DNS Query
ftp.cisco.com?
DNS Reply
209.165.201.10
DNS Reply Modification
209.165.201.10 10.1.2.56
DNS Reply
10.1.2.56
FTP Request
209.165.201.10
Dest Addr. Translation
209.165.201.1010.1.2.56
FTP Request
10.1.2.56
Security
Appliance
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