DG-BG4300N User Manual

6.6.3 Tunnel Configuration

This configuration provides a configuration for tunneling an IPv6 network and traffic through a

pre-existing IPv4 network. This technique allows you to connect IPv6 sites over the IPv4

backbone that exists.

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6.6.4 Other Advanced Configuration

Here you can set other miscellaneous advanced settings.

Half Bridge:

When the PPP Half Bridge is enabled the WAN IP address from the ISP is passed straight through the

modem to the local client PC. Only one PC is able to access the Internet using half bridge mode as NAT

is disabled. Half bridge mode can only be used when a single IP address has been assigned by the ISP,

it is not suitable for services that provide multiple IP addresses. Half bridge mode is used when the use

of NAT or NAPT is not desired and there is a single computer attached to the modem. When the half-

bridged modem is used in conjunction with a router handling DHCP, only then multiple computers can

connect to the Internet.

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7. Service Setup

7.1 IGMP Configuration

Multicasting is useful when the same data needs to be sent to more than one hosts. Using

multicasting as opposed to sending the same data to the individual hosts uses less network

bandwidth. The multicast feature also enables you to receive multicast video stream from multicast

servers.

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IP hosts use Internet Group Management Protocol (IGMP) to report their multicast group

memberships to neighboring routers. Similarly, multicast routers use IGMP to discover which of their

hosts belong to multicast groups. This device supports IGMP proxy that handles IGMP messages.

When enabled, this device acts as a proxy for a LAN host making requests to join and leave multicast

groups, or a multicast router sending multicast packets to multicast group on the WAN side.

When a host wishes to join a multicast group, it sends IGMP REPORT message to the device’s IGMP

downstream interface. The proxy sets up a multicast route for the interface and host requesting the

video content. It then forwards the Join to the upstream multicast router. The multicast IP traffic will

then be forwarded to the requesting host. On a leave, the proxy removes the route and then forwards

the leave to the upstream multicast router.

7.1.1 IGMP Proxy Configuration

The IGMP Proxy page allows you to enable multicast on WAN and LAN interfaces. The LAN

interface is always served as downstream IGMP proxy, and you can configure one of the available

WAN interfaces as the upstream IGMP proxy.

Upstream:

The interfaces that IGMP requests from hosts are sent to the multicast router.

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Downstream:

The interface data from the multicast router are sent to hosts in the multicast group

database.

Fields in this page:

Field

Description

IGMP Proxy

Enable/Disable IGMP proxy feature

Proxy Interface

The upstream WAN interface is selected here.

7.1.2 MLD Configuration

Multicast Listener Discovery (MLD) is a component of the Internet Protocol Version 6 (IPv6) suite. MLD

is used by IPv6 routers for discovering multicast listeners on a directly attached link, much like IGMP is

used in IPv4. The protocol is embedded in ICMPv6 instead of using a separate protocol. MLDv1 is