ZyXEL Communications ISG50-ISDN User Manual page 326

Chapter 18 NAT
Table 103 Configuration > Network > NAT > Add (continued)
LABEL
Classification
Incoming
Interface
Original IP
User Defined
Original IP
Original IP
Subnet/Range
Mapped IP
User Defined
Original IP
Mapped IP
Subnet/Range
326
DESCRIPTION
Select what kind of NAT this rule is to perform.
Virtual Server - This makes computers on a private network behind the ISG50
available to a public network outside the ISG50 (like the Internet).
1:1 NAT - If the private network server will initiate sessions to the outside
clients, select this to have the ISG50 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 ISG50 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.
Select the interface on which packets for the NAT rule must be received. It can be
an Ethernet, VLAN, bridge, or PPPoE/PPTP interface.
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.
This field is available if Original IP is User Defined. Type the destination IP
address that this NAT rule supports.
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.
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
ISG50. If you select one of them, this NAT rule supports the IP address specified
by the address object.
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.
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