Zyxel VES-1624FT-55A [233/312] Overview

Zyxel VES-1624FT-55A [233/312] Overview
VES-1624FT-55A User’s Guide
233
CHAPTER 44
N1MAC
44.1 Overview
N1MAC is multiple-to-one MAC address conversion. N1MAC allows the IP DSLAM (A) to
replace the MAC addresses of subscriber xDSL modems (S) with the IP DSLAM’s MAC
address in upstream packets. This removes the need to maintain a big MAC address table and
prevents MAC spoofing attacks on central devices behind the IP DSLAM.
In this example, N1MAC is enabled on ports 1, 3 and 5 for traffic forwarded from three VDSL
modems. A replaces subscriber xDSL modem MAC addresses (MAC1, MAC2 and MAC3)
with its MAC address (MAC-A) on a frame forwarded to the backbone network (B).
Backbone devices only see a frame from A and record only As MAC address in their MAC
tables.
Figure 126 N1MAC
44.2 N1MAC Screen
Use this screen to enable or disable N1MAC on xDSL subscriber ports. To open this screen,
click Advanced Application > N1MAC.
B
MAC-A
A
S
MAC1
MAC2
MAC3
1
5
3

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