ZyXEL Communications NXC5200 User Manual page 221

Table 78 Configuration > Network > NAT > Add/Edit (continued)
LABEL
User Defined
Original IP
Mapped IP
Subnet/Range
Port Mapping
Type
Protocol Type
Original Port
Mapped Port
Original Start
Port
Original End
Port
Mapped Start
Port
Mapped End
Port
Enable NAT
Loopback
NXC5200 User's Guide
DESCRIPTION
This field is available if Mapped IP is User Defined. Type the translated
destination IP address that this NAT rule supports.
This field displays for Many 1:1 NAT. Select to which translated
destination IP address 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.
Use the drop-down list box to select how many original destination ports
this NAT rule supports for the selected destination IP address (Original
IP). Choices are:
Any - this NAT rule supports all the destination ports.
Port - this NAT rule supports one destination port.
Ports - this NAT rule supports a range of destination ports. You might
use a range of destination ports for unknown services or when one
server supports more than one service.
This field is available if Mapping Type is Port or Ports. Select the
protocol (TCP, UDP, or Any) used by the service requesting the
connection.
This field is available if Mapping Type is Port. Enter the original
destination port this NAT rule supports.
This field is available if Mapping Type is Port. Enter the translated
destination port if this NAT rule forwards the packet.
This field is available if Mapping Type is Ports. Enter the beginning of
the range of original destination ports this NAT rule supports.
This field is available if Mapping Type is Ports. Enter the end of the
range of original destination ports this NAT rule supports.
This field is available if Mapping Type is Ports. Enter the beginning of
the range of translated destination ports if this NAT rule forwards the
packet.
This field is available if Mapping Type is Ports. Enter the end of the
range of translated destination ports if this NAT rule forwards the packet.
The original port range and the mapped port range must be the same
size.
Enable NAT loopback to allow users connected to any interface (instead
of just the specified Incoming Interface) to use the NAT rule's
specified Original IP address to access the Mapped IP device. For
users connected to the same interface as the Mapped IP device, the
NXC uses that interface's IP address as the source address for the traffic
it sends from the users to the Mapped IP device.
For example, if you configure a NAT rule to forward traffic from the WAN
to a LAN server, enabling NAT loopback allows users connected to other
interfaces to also access the server. For LAN users, the NXC uses the LAN
interface's IP address as the source address for the traffic it sends to the
LAN server.
If you do not enable NAT loopback, this NAT rule only applies to packets
received on the rule's specified incoming interface.
Chapter 14 NAT
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