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Page 86 / 131 Scroll up to view Page 81 - 85
6381-A4 Router Users Guide
86
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
.
Page 87 / 131
6381-A4 Router Users Guide
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).
Page 88 / 131
6381-A4 Router Users Guide
88
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
.
Page 89 / 131
6381-A4 Router Users Guide
89
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
Page 90 / 131
6381-A4 Router Users Guide
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.

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