ZyXEL VLC1324G Bedienungsanleitung PDF herunterladen (Seite 19)

Chapter 1 VLC Overview

VLC1324G User’s Guide

DHCP Snooping

DHCP snooping allows the system to identify packets with DHCP server assigned IP

address(es) and block access of devices using unknown IP addresses on a subscriber port. You

can also manually add static IP addresses to the DHCP snooping table.

LAN 2 LAN

LAN 2 LAN allows you to control whether or not a DHCP server connected to a subscriber

port is permitted to receive and send traffic through the IES.

Anti-IP Address Spoofing

With DHCP snooping, a line card records which IP addresses are assigned on each port. The

line card drops packets from a device using a different IP address.

Anti-MAC Address Spoofing

The VLC checks to make sure the MAC addresses of the devices connected to the DSL ports

are not the same as MAC addresses of devices connected to the Ethernet network. This

protects the network from disruptions of service caused by subscriber devices spoofing the

MAC address of ISP servers.

ARP Inspection

ARP inspection drops ARP packets if the MAC address to IP address binding does not match

that of a learned or manually added trusted client. This prevents many common man-in-the-

middle attacks.

Transparent LAN Service (TLS)

Use TLS (also known as VLAN stacking) to add an outer VLAN tag to the inner IEEE 802.1Q

tagged frames that enter the network. This allows a service provider to provide different

services based on specific VLANs, for many different customers.

VDSL Double-Tag VLAN

DT VLAN (Double-Tag VLAN) adds two VLAN tags to untagged frames received on a

VDSL port. These two VLAN tags consist of an inner c-tag (customer tag) and an outer s-tag

(service provider tag). These double VLAN tags consist of an inner c-tag (customer tag) and

an outer s-tag (service provider tag). The line card drops any tagged frames it receives from a

subscriber.

Double-Tag PVC (DTPVC)

For VDSL2 ports operating in ADSL2+ connection mode, DTPVCs (Double-Tag Permanent

Virtual Circuits) add double VLAN tags to untagged frames received from a DSL subscriber

on the specified PVC. These double VLAN tags consist of an inner c-tag (customer tag) and an

outer s-tag (service provider tag). The line card drops any tagged frames received on the

DTPVC. DTPVCs support DHCP relay, IGMP, IEEE 802.1x and PPPoE agent.

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