Planet Networking & Communication MH-5001 User Manual page 73

MH-5001 User Manual
Map a pool of private IP addresses to a subnet
range of public IP addresses chosen from the
WAN ports. Only when all ports of the first
Many-to-Many
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.
This was useful when you have multiple public
One-to-One
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 IP
One-to-One
address. Notice that you must add a firewall
(bidirectional)
rule to forward WAN to LAN/DMZ traffic.
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.
Table 7-5 The NAT type comparison
70
Chapter 7
NAT