Installation manual

OfficeServ 7400 System Description

4.3.3 Security

NAT/PT (In/Out/Exclusive/Redirect)

The security function supports the conversion function between the private IP address and

public IP address in the network where security is required.

The Inbound, Outbound, Exclusive, and Redirect functions are supported.

y In bound: This function performs the forwarding process for the packet flowing from the

WAN to the IP and port of the LAN specified in the NAT/PT conversion table.

y Outbound: This function converts the IP address of the transmitter into the global IP

address according to the NAT/PT conversion table for transmitting the packet from the

LAN to the WAN.

− Exclusive: This function is used for the IP address that is not applied by the NAT/

PT conversion.

− Redirect: When the Domain Name Server (DNS) server IP in the data server

management sector is changed, each IP terminal uses the pre-DNS IP and the this

function changes the DNS IP by registering the post-DNS IP into the Redirect table

Firewall

y Access filtering

This function prevents the access to disallowed IP address to control the access for the

resource non-disclosed to the outside and to control the external resource for which the

membership in the LAN may access.

y DMZ function

This function is used for connecting the web server and mail server, which are firewall-

protected LAN networks but need to be freely accessed from the outside, to the subnet

separated from the LAN network where the firewall blocking is not applied. In this way,

the access from the outside can be more smoothly with the access control service

through the firewall.

y Port Forwarding

This function is almost the same as the DMZ function but is used for connecting to

specific network without the separately divided DMZ port. This function is used for the

Extra network services as well as the DMZ function. The Extra network is configured

for the party out of the office to access Intranet in the office through Internet.

In this network, the user should take care of security on Intranet.