Cisco ASA 5505 - Manual (Page 595)

30-13
Cisco ASA 5500 Series Configuration Guide using the CLI
Chapter 30 Configuring Network Object NAT
Configuring Network Object NAT
Example
The following example maps a host address to itself using an inline mapped address:
hostname(config)# object network my-host-obj1
hostname(config-network-object)# host 10.1.1.1
hostname(config-network-object)# nat (inside,outside) static 10.1.1.1
Step 3 {host ip_address | subnet subnet_address
netmask | range ip_address_1 ip_address_2}
Example:
hostname(config-network-object)# subnet
10.1.1.0 255.255.255.0
If you are creating a new network object, defines the real IP
address(es) to which you want to perform identity NAT. If you
configured a network object for the mapped addresses in
Step 1 ,
then these addresses must match.
Step 4 nat [(real_ifc,mapped_ifc)] static
{mapped_inline_ip | mapped_obj}
[no-proxy-arp] [route-lookup]
Example:
hostname(config-network-object)# nat
(inside,outside) static MAPPED_IPS
Configures identity NAT for the object IP addresses.
Note You can only define a single NAT rule for a given object.
See the
“Additional Guidelines” section on page 30-2 .
See the following guidelines:
• Interfaces—(Required for transparent mode) Specify the real
and mapped interfaces. Be sure to include the parentheses in
your command. In routed mode, if you do not specify the real
and mapped interfaces, all interfaces are used; you can also
specify the keyword any for one or both of the interfaces.
• Mapped IP addresses—Be sure to configure the same IP
address for both the mapped and real address. Use one of the
following:
– Network object—Including the same IP address as the
real object (see
Step 1 ).
– Inline IP address—The netmask or range for the mapped
network is the same as that of the real network. For
example, if the real network is a host, then this address
will be a host address. In the case of a range, then the
mapped addresses include the same number of addresses
as the real range. For example, if the real address is
defined as a range from 10.1.1.1 through 10.1.1.6, and
you specify 10.1.1.1 as the mapped address, then the
mapped range will include 10.1.1.1 through 10.1.1.6.
• No Proxy ARP—Specify no-proxy-arp to disable proxy
ARP for incoming packets to the mapped IP addresses. See
the
“Mapped Addresses and Routing” section on page 29-22
for more information.
• Route lookup—(Routed mode only; interface(s) specified)
Specify route-lookup to determine the egress interface using
a route lookup instead of using the interface specified in the
NAT command. See the
“Determining the Egress Interface”
section on page 29-24 for more information.
Command Purpose