ZyXEL VDSL2 User Manual download pdf (Page 20)

Chapter 1 VLC Overview

VLC1324G User’s Guide

DHCP Relay

DHCP (Dynamic Host Configuration Protocol RFC 2131 and RFC 2132) allows individual

computers to obtain TCP/IP configuration at start-up from a server. You can configure the

system as a DHCP relay agent to have another DHCP server provide TCP/IP configuration for

the clients. In addition, you can set the system to forward client DHCP requests to specific

DHCP servers based on the VLAN ID. You can also specify up to two DHCP servers for each

VLAN to provide failover protection.

Rate Limiting

Rate limiting on the subscriber ports allows service providers to offer tiered service in

increments of 64 Kbps. This service differentiation is not only to fulfill the needs of different

customers, but also to provide a network infrastructure that combines guaranteed performance

and flexibility in service provisioning.

DHCP Relay Option 82

The system supports DHCP relay agent82 (RFC 3046) that adds additional information to

client DHCP requests that the MSC relays to a DHCP server. It also supports adding the sub-

option 2 (Remote ID) with additional information.

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.

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.

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.

1.4 Front Panel of VLC

The figure below shows the front panel of the VLC.

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ZyXEL VDSL2 User Manual Page 20