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2.

From the left hand navigation pane select

IGMP Proxy

.

3.

Enter a check in the

Enable IGMP Proxy

check box

4.

From the

Interface

Upstream/Downstream/Ignore

dropdowns select the LAN groups to

and whether they should allow IGMP proxies from upstream or downstream.

To match the example above:

•

DHCP1: Downstream

•

PPPoE1: Downstream

•

LAN group 1: Upstream

•

LAN group 2: Ignore

•

LAN group 3: Downstream

5.

Click

Apply

The

Apply

button will temporarily save this connection. To make the change permanent,

click

Tools

(at the top of the page) and select

System Commands

. On the

System

Commands

page, click

Save All

.

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87

Static Routing

The

Static Routing

page enables you to define routes for specific subnets on the WAN/LAN

side. The 6381 RG allows you to manually program the RG's routing table. Up to 16 static routes

can be added.

New Destination IP

The address of the remote LAN network or host to which you want to assign a

static route. For a standard Class C IP domain, the network address is the first

three fields of the New Destination IP, while the last field should be 0.

Subnet Mask

Identifies which portion of an IP address is the network portion, and which portion

is the host portion. For a full Class C Subnet, the Subnet Mask is 255.255.255.0.

Gateway

Gateway is the IP address of the device that allows contact between the modem

and the remote network or host.

Metric

Metric determines the maximum number of steps (hops) between network nodes

that data packets will travel. A node is any device on the network (such as a

router or switch).

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To define a static route between networks:

6.

From the navigation bar at the top of the screen click

Advanced

7.

From the left hand navigation pane select

Static Routing

.

8.

From the

Choose a connection

dropdown select the connection which to add the static

route.

9.

In the

New Destination IP

,

Gateway

,

Mask

, and

Metric

text boxes, enter the appropriate

information.

To match the example above:

•

New Destination IP

:

10.0.0.0

(the network IP address of the subnet)

•

Mask

:

255.255.255.0

(the subnet mask)

•

Gateway

:

192.168.1.5

(the LAN-side IP address of the second router, through which

the stations in the subnet access the network)

•

Metric

:

0

You are telling the RG that a new subnet with an IP of

10.0.0.0

and a netmask of

255.255.255.0

has been added and can access the RG via station

192.168.1.5

. The metric

is

0

since the subnet is one level down on the LAN.

10.

You can add up to 16 entries.

11.

Click

Apply

The

Apply

button will temporarily save this connection. To make the change permanent,

click

Tools

(at the top of the page) and select

System Commands

. On the

System

Commands

page, click

Save All

.

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Dynamic Routing

Dynamic Routing enables the 6381 RG to dynamically define routes for WAN and LAN subnets.

Dynamic routing uses routing information protocol (RIP) for exchanging routing information with

other routers in the network. It is supported across both WAN and LAN interfaces. Any RIP-

enabled router sends out automatic update packets containing its own routing table on a periodic

basis (every 30 secs). Similarly, it accepts such periodic updates from other routers and adds,

deletes, or modifies routes in its own routing table accordingly. The router is also expected to

receive requests for its routing table and respond accordingly. Use the Dynamic Routing page to

define dynamic routing routes for the available interfaces.

Dynamic Routing allows the modem to automatically adjust to physical changes in the network.

The modem, using the routing information protocol (RIP), determines the network packets’ route

based on the fewest number of hops between the source and the destination. The RIP protocol

regularly broadcasts routing information to other modems on the network. The 6381 support RIP

across both WAN and LAN interfaces.

RIP enabled routers send out updates of its routing table periodically and accepts updates from

other routers to add, delete or modify routes in its routing table. The router will also send updates

to its routing table upon request.

You can enable dynamic routing on all routers, so you do not have to manually enter the

individual routes. To enable dynamic routing you need to enable all routers on this network and

they should use the same protocol so they are able to communicate with each other.

To demonstrate the use of the dynamic routing feature, consider an expanded version of the

network used in the static routing example (see

Static Routing

).

As shown above, you have a network with two LAN connections (192.168.1.x and 172.168.1.x),

and each has a router and a subnet. How can host A in subnet 1 (193.168.1.x) talk to host B in

subnet 2 (173.168.1.x)? You have two options:

• As shown using the static routing feature (see Static Routing), you can add both subnets to the

routing table using the Static Routing page (two separate entries).

• You can enable dynamic routing on all routers without having to manually enter the individual

routes. Keep in mind that you need to enable all routers on this network and they should use the

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90

same protocol to be able to communicate with each other. The following procedure shows you

how to enable and configure the dynamic routing feature on your RG.

Enable RIP

Enables/disables RIP.

Protocol

The following three RIP versions are available:

•

RIP v1 (UDP protocol)

•

RIP v2 (multicast protocol)

•

RIP v1 compatible (UDP protocol with multicast format)

Note: Routers using RIP v1 or RIP v1-compatible protocol can talk to each

other, but not to routers using RIP v2 protocol.

Enable Password

This is an optional field. RIP version v2 compatibility allows you to provide

simple plain-text password-based authentication to RIP packets. This field is

disabled if RIP v1 protocol is selected.

Password

The password can be up to 16 characters long.

Direction

Normally when RIP is enabled on a router, it dynamically learns/provides routes

on all its configured interfaces. This parameter allows you to select the

interfaces on which RIP is expected to learn and distribute routing information.

This feature allows you to control how and which routes get distributed through

the network. For example, by selecting In only mode, routes to private LAN

networks are prevented from being sent over to the WAN-side router.

To enable dynamic routing:

1.

From the navigation bar at the top of the screen click

Advanced

2.

From the left hand navigation pane select

Dynamic Routing

.

3.

If appropriate, select

Enable RIP

and from the

Protocol

dropdown select the appropriate

version of RIP.

The protocol is dependent upon the entire network. Most networks support RIP v1. If RIP v1

is selected, routing data will be sent in RIP v1 format. If Rip V2 is selected, routing data will

be sent in RIP v2 format using subnet broadcasting. If RIP V1 Compatible is selected,

routing data will be sent in RIP v2 format using multicasting.