Knowledge Base

How to Let a Server Use the Same Public IP Address as the WAN Interface Using the Bridge Interface?


This is an example of using ZyWALL/USG to configure an internal server in bridge mode without applying network address translation (NAT). The Internet users can reach this server directly by its public IP address.
Figure.   ZyWALL/USG with Bridge Interface Example


Set Up the Bridge Interface on the ZyWALL/USG 
1. In the ZyWALL/USG, go to CONFIGURATION > Network > Interface > Bridge > add Bridge, select Interface Type to be the general type, select Zone to be the LAN zone. In the Member Configuration, select internal server (IntServer1 interface in this example) and public IP address (Public WAN interface in this example) to be in the same member group. 
In the IP Address Assignment section, select Used Fixed IP Address and configure br1 IP address ( in this example).
CONFIGURATION > Network > Interface > Bridge > add Bridge
2. After creating the bridge interface, connect the server's network cable to IntServer1 port and set the server's IP to be in the same subnet ( in this example).



1. Check the Interface Statistics, you can see br1 Status is up, Tx B/s displays the transmission speed and Rx B/s displays the reception speed. IntServer1 and PublicWAN are configured in the same vlan1 but using different IP address.
MONITOR > Interface Status > Interface Statistics 
2. Server can access Internet successfully by using its IP address ( in this example) and Internet users can also reach this server by this public address as well.
Windows 7 > cmd > ping
What Can Go Wrong? 
If you cannot configure a particular bridge IP address, please check is this IP address already created on other Ethernet interface.



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Question Profile

TYPE:Application / Configuration Example
FIRMWARE:ZLD 4.13 and above
MODEL:USG110,USG1100,USG1900 (view more model name)

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