Wellink Corporation NEOBIT1014VA ユーザーズマニュアル

apply to accesses to the specified server type at the 
specified IP address or network. 

7.  Follow steps 7-12 under "The napt rule" on page 68 to 

submit your changes. 

Unlike the other NAT flavors, the bimap flavor performs address 
translations in both the outgoing and incoming directions.  

In the incoming direction, when the specified NEOBIT 1014VA 
interface receives a packet with your public IP address as the 
destination address, this address is translated to the private IP 
address of a computer on your LAN. To the external computer, it 
appears as if the access is being made to the public IP address, 
when, in fact, it is communicating with a LAN computer. 

In the outgoing direction, the private source IP address in a data 
packet is translated to the LAN’s public IP address. To the rest of 
the Internet, it appears as if the data packet originated from the 
public IP address. 

Bimap rules can be used to provide external access to a LAN 
device. They do not provide the same level of security as rdr rules, 
because rdr rules also reroute incoming packets based on the port 
ID. Bimap rules do not account for the port number, and therefore 
allow external access regardless of the destination port type 
specified in the incoming packet. 

Figure 36 shows the fields used to establish a bimap rule.  

 

 

Follow these instructions to add a bimap rule (see steps 1-4 under 
"The napt rule" on page 68 for specific instructions corresponding to 
steps 1 and 2 below): 

1.  Display the NAT Rule – Add Page, select BIMAP as the 

Rule Flavor, and enter a Rule ID. 

2.  Select the interface on which this rule will be effective. 

3.  In the Local Address field, type the private IP address of the 

computer to which you are granting external access. 

4.  In the Global Address field, type the address that you want 

to serve as the publicly known address for the LAN computer.