Avaya IP Office (R3.0) User Manual page 14

Page 14 - Overview of Secure VPN Implementation
The Logical and System LAN interfaces use different MAC addresses, function on a
common Layer 2 collision domain but operate on separate Layer 3 subnets. Both the
Logical and System LANs are tied to a same Physical LAN
The Logical LAN feature allows single LAN systems such as the IP403 and IP406 to be
used in conjunction with an external Internet router or xDSL device. The feature allows
single LAN systems to operate external and internal IP subnets in support of VPN
networking
NAT functionality is applied to traffic from LAN1 using the IP address assigned to the
Logical LAN. This and other Logical LAN facilities are detailed in the Public Interface
section (see page 17). In addition, an example of the use of a Logical LAN can be seen
on page 34.
For dual LAN systems the second Physical LAN interface (LAN2) should be used as
the Public (External) LAN interface.
Page 14 - Overview of Secure VPN Implementation
Logical LAN Implementation 40DHB0002UKER Issue 3 (4th February 2005)
IP Office (R3.0)