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Chapter 9. Transparent Mode > Solutions Fast Track

Solutions Fast Track

Interface Modes

The interfaces on a Juniper firewall can operate in three different modes: NAT (Network Address Translation), route, and transparent.
When an interface is placed in NAT mode, the Juniper device replaces the private, unroutable IP (Internet Protocol) address of the host with the IP address of the interface in the Untrust zone.
With route mode, the device passes traffic from one zone to another without performing NAT translation.


Understanding How Transparent Mode Works

The Juniper firewall operates at layer 2.
Two methods exist for performing ARP: flood and ARP/traceroute.
The VLAN zone hosts the VLAN1 interface.



  

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