Cisco ASA 5512-X Cli Configuration Guide

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Cisco ASA Series CLI Configuration Guide
Chapter 1 Configuring Network Object NAT
Configuration Examples for Network Object NAT
When an inside host sends a DNS request for the address of ftp.cisco.com, the DNS server replies with
the mapped address (209.165.201.10). The ASA refers to the static rule for the inside server and
translates the address inside the DNS reply to 10.1.3.14. If you do not enable DNS reply modification,
then the inside host attempts to send traffic to 209.165.201.10 instead of accessing ftp.cisco.com
directly.
Figure 1-5 DNS Reply Modification
Step 1 Create a network object for the FTP server address:
hostname(config)# object network FTP_SERVER
Step 2 Define the FTP server address, and configure static NAT with DNS modification:
hostname(config-network-object)# host 10.1.3.14
hostname(config-network-object)# nat (inside,outside) static 209.165.201.10 dns
DNS Server
Outside
Inside
User
130021
1
2
3
4
5
DNS Reply Modification
209.165.201.10 10.1.3.14
DNS Reply
209.165.201.10
DNS Reply
10.1.3.14
DNS Query
ftp.cisco.com?
FTP Request
10.1.3.14
Security
Appliance
ftp.cisco.com
10.1.3.14
Static Translation
on Outside to:
209.165.201.10

Cisco ASA 5512-X Specifications

General

Firewall Throughput	1.2 Gbps
VPN Throughput	200 Mbps
Maximum VPN Peers	250
Integrated IPS	Yes
IPS Throughput	250 Mbps
RAM	4 GB
Power Supply	AC, 100-240V
Security Contexts	2 (Standard), 50 (with Security Contexts license)
Interfaces	6 x Gigabit Ethernet
Dimensions (H x W x D)	1.75 x 17.5 x 14.5 inches
Weight	16 lbs