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MH-5000 User Manual
If you choose Full Feature mode of NAT at Table 7-4, you may need to edit the rule by yourself. Then you must
determine the NAT type in the NAT rule. What meaning does each NAT type represent? How to determine which NAT
type is best choice for you. You can lookup the explainations and suggestions at Table 7-5.
Type
Map a pool of private IP addresses to a
Many-to-One
single public IP address chosen from the
WAN ports.
Map a pool of private IP addresses to a
subnet range of public IP addresses
chosen from the WAN ports. Only when all
Many-to-Many
ports of the first public IP are used, it will
then use the next public IP address for
transferring by all private IPs.
Map a single private IP address to a single
public IP address chosen from the WAN
ports.
One-to-One
This was useful when you have multiple
public IPs in the WAN ports. And you
intended to map each local server to a
unique public IP on the WAN port.
An internal host is fully mapped to a WAN
One-to-One
IP address. Notice that you must add a
(bidirectional)
firewall rule to forward WAN to LAN/DMZ
traffic.
Description
Table 7-5 The NAT type comparison
If the public IP addresses of your company is insufficient,
and you prefer to increase the node which can connect to
the internet. You can just choose the Many-to-One type to
fit your request.
If the public IP address of your company is not only one
node (ex. you have applied extra-one ISP). You may use
the Many-to-Many type to make the multiple public
addresses sharing the outbound bandwidth. So your
inbound and outbound traffic will be more flexible.
If you wish to specify a unique internal IP address to
transfer a fixed external IP address. You can specify the
One-to-One type.
If you wish to expose the local pc onto the internet, and
open all internet services outside. You can specify the
One-to-One (bidirectional) type. This will make the local
pc you specified fully exposed to the internet. Additionally
you must add a firewall rule to allow WAN to LAN (or
DMZ) traffic forward. Then you can finish the settings. Be
careful to use this type, or it will endanger your network
security.
68
Usage moment
Chapter 7
NAT
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