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How to configure Transparent Mode in DHCP network environment 

This scenario shows how a firewall in 

Transparent Mode

 can be placed into an existing 

DHCP network between an Internet access router and 

LAN

, without the need to 

reconfigure clients in 

LAN. 

 

The 

WAN

 and 

LAN

 interfaces of the firewall will be configured to operate in Transparent 

Mode. It is preferred to configure IP addresses on the 

WAN

 and 

LAN

 interfaces, as this can 

improve performance during automatic discovering of hosts. 

Summary of Contents for NetDefend DFL Series

Page 1: ...in this document are adapted for the DFL 800 The same settings can easily be used for all other models in the series The only difference is the names of the interfaces Since the DFL 1600 and DFL 2500 has more than one lan interface the lan interfaces are named lan1 lan2 and lan3 not just lan The screenshots in this document is from firmware version 2 11 02 If you are using an earlier version of th...

Page 2: ...isting DHCP network between an Internet access router and LAN without the need to reconfigure clients in LAN The WAN and LAN interfaces of the firewall will be configured to operate in Transparent Mode It is preferred to configure IP addresses on the WAN and LAN interfaces as this can improve performance during automatic discovering of hosts ...

Page 3: ...work object Name gw world IP Address 192 168 1 254 Click OK Go to Interfaces Ethernet Make sure the lan interface has the following settings IP Address lan_ip Network lannet Default Gateway None Select Enable Transparent Mode checkbox Click OK The settings for the wan1 interface should be IP Address wan1_ip Network wan1net Default Gateway gw world Select Enable Transparent Mode checkbox Click OK S...

Page 4: ...rver to offers IP address for network clients in transparent mode Go to Objects Address book InterfaceAddresses Add DHCP server address object For example Name DHCP_server IP address 192 168 1 250 Click OK Go to System DHCP DHCP Relays Add DCHP relay Name DHCP Action Relay Source Interface lan DHCP Server to relay to DHCP_server Allowed IP offers from server all nets Click OK Save and Activate ...

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