ZyXEL Communications NXC2500 User Manual page 154

Table 76 Configuration > Network > NAT > Add/Edit (continued)
LABEL DESCRIPTION
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 Select the interface on which packets for the NAT rule must be received. It can be an
Interface 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.
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.
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 This field is available if Original IP is User Defined. Type the destination IP address that
Original IP this NAT rule supports.
Original IP This field displays for Many 1:1 NAT. Select the destination IP address subnet or IP address
Subnet/Range 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.
User Defined This field is available if Mapped IP is User Defined. Type the translated destination IP
Original IP address that this NAT rule supports.
Mapped IP This field displays for Many 1:1 NAT. Select to which translated destination IP address
Subnet/Range subnet or IP address range this NAT rule forwards packets. The original and mapped IP
address subnets or ranges must have the same number of IP addresses.
Chapter 11 NAT
NXC Series User's Guide
154