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Chapter 14 NAT

NXC5200 User’s Guide

220

Rule Name

Type in the name of the NAT rule. The name is used to refer to the NAT
rule. You may use 1-31 alphanumeric characters, underscores(

), or

dashes (-), but the first character cannot be a number. This value is
case-sensitive.

Classification

Select what kind of NAT this rule is to perform.

Virtual Server - This makes computers on a private network behind the
NXC available to a public network outside the NXC (like the Internet).

1:1 NAT - If the private network server will initiate sessions to the
outside clients, select this to have the NXC translate the source IP
address of the server’s outgoing traffic to the same public IP address
that the outside clients use to access the server.

Many 1:1 NAT - If you have a range of private network servers that will
initiate sessions to the outside clients and a range of public IP addresses,
select this to have the NXC translate the source IP address of each
server’s outgoing traffic to the same one of the public IP addresses that
the outside clients use to access the server. The private and public
ranges must have the same number of IP addresses.

One many 1:1 NAT rule works like multiple 1:1 NAT rules, but it eases
configuration effort since you only create one rule.

Incoming
Interface

Select the interface on which packets for the NAT rule must be received.

It can be an Ethernet or VLAN interface.

Original IP

Specify the destination IP address of the packets received by this NAT
rule’s specified incoming interface.

any - Select this to use all of the incoming interface’s IP addresses
including dynamic addresses or those of any virtual interfaces built upon
the selected incoming interface.

User Defined - Select this to manually enter an IP address in the User
Defined field. For example, you could enter a static public IP assigned
by the ISP without having to create a virtual interface for it.

Host address - select a host address object to use the IP address it
specifies. The list also includes address objects based on interface IPs.
So for example you could select an address object based on a WAN
interface even if it has a dynamic IP address.

User Defined
Original IP

This field is available if Original IP is User Defined. Type the
destination IP address that this NAT rule supports.

Original IP
Subnet/Range

This field displays for Many 1:1 NAT. Select the destination IP address
subnet or IP address range that this NAT rule supports. The original and
mapped IP address subnets or ranges must have the same number of IP
addresses.

Mapped IP

Select to which translated destination IP address this NAT rule forwards
packets.

User Defined - this NAT rule supports a specific IP address, specified in
the User Defined field.

HOST address - the drop-down box lists all the HOST address objects in
the NXC. If you select one of them, this NAT rule supports the IP address
specified by the address object.

Table 78

Configuration > Network > NAT > Add/Edit (continued)

LABEL

DESCRIPTION