Configuring Your Gateway

Advanced Wireless Settings Menu

Using the Advanced Wireless Settings Filtering menu, you can configure advanced wireless

settings for the Gateway.

To access the Advanced Wireless Settings menu, click

Wireless

in the menu bar and then

click the

Advanced Wireless Settings

submenu. Figure 23 shows an example of the menu

and Table 11 describes the settings you can select.

Note:

The

Advanced Wireless Settings

submenu is not available in the menu bar if wireless

operation is disabled in the Wireless Basic Settings menu (see page 35).

Figure 23. Wireless Advanced Settings Menu

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Configuring Your Gateway

Table 11. Wireless Advanced Settings Options

Option

Description

BG Protection Mode

This mode is a protection mechanism that prevents collisions among 802.11b/g modes. Choices are:

Auto = BG protection mode goes on or off automatically as needed.

Always-On = BG protection mode is always on.

Always-Off = BG protection mode is always off. (

default

)

IGMP Snooping

Enables or disables the Gateway from forwarding multicast traffic intelligently.

•

Enable = Gateway listens to IGMP membership reports, queries, and leave messages to identify the

Gateway ports that are members of multicast groups. Multicast traffic will only be forwarded to ports

identified as members of the specific multicast group or groups..

•

Disable = Gateway does not analyze all IGMP packets. (

default

)

WMM Configuration

Displays a screen for selecting Wi-Fi Multimedia (WMM) settings for your wireless access point(s).

HT Physical Mode

Operating Mode

Lets you select between Mixed Mode and Green Field.

Mixed Mode = provides backward compatibility with IEEE 802.11n/a/g/b devices. (

default

)

Green Field = used for pure network of 802.11n access points and clients, taking full advantage of the

high-throughput capabilities of the 11n MIMO architecture

Channel BandWidth

Select a channel bandwidth of 20 or 20/40.

•

20 = allows only single-channel operation (e.g., 20 MHz).

•

20/40 = allows both single channel operation (20 MHz) and the wider bandwidth operation (40 MHz) by

using two or more adjacent (contiguous channels). A 20/40 BSS is a wireless network that allows a

wider bandwidth operation mode. (

default

)

Guard Interval

The guard interval is the period in nanoseconds that the Gateway listens between packets. Choices are:

•

Long = 800 ns guard interval.

•

Short = 400 ns guard interval (

default

)

MCS

Modulation Coding Scheme (MCS) is a specification of PHY parameters consisting of modulation order

(BPSK, QPSK, 16-QAM, 64-QAM) and FEC code rate (1/2, 2/3, 3/4, 5/6). MCS is used in your Gateway to

define 32 symmetrical settings. MCS provides for potentially greater throughput. High throughput data

rates are a function of MCS, bandwidth, and guard interval. Default is auto.

Reverse Direction Grant

(RDG)

Speeds up data transmission between the Gateway and 802.11n access points and clients by allowing

wireless workstations to send/receive data simultaneously, without contending for shared medium. Default

is enable.

Extension Channel

Defines a second 20-MHz channel. 40-MHz stations can use this channel in addition to using the control

channel simultaneously.

Aggregation

MSDU(A_MSDU)

Enables or disables aggregation of multiple MSDUs in one MPDU. Default is disable.

Auto Block ACK

Enables or disables Auto Block ACL function. Default is disable.

Decline BA Request

Enables or disables the BA request function. Default is disable.

Other

HT TxStream

Select 1 or 2 from the pull-down menu. Default is 2.

HT RxStream

Select 1 or 2 from the pull-down menu. Default is 2.

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SMCD3GN Wireless Cable Modem Gateway User Manual

Configuring Your Gateway

Port Forwarding Menu

The Port Forwarding menu lets you configure the Gateway to provide port-forwarding

services that let Internet users access predefined services such as HTTP (80), FTP (20/21),

and AIM/ICQ (5190) as well as custom-defined services. You perform port forwarding by

redirecting the WAN IP address and the service port to the local IP address and service port.

You can configure a maximum of 100 predefined and custom-defined services.

To access the Port Forwarding menu, click

NAT

in the menu bar and then click the

Port

Forwarding

submenu in the menu bar. Figure 18 shows an example of the menu.

Figure 24. Port Forwarding Settings Menu

Adding a Port Forwarding Entry for a Predefined Service

Using the following procedure, you can select well-known services and specify the LAN host

IP address(es) that will provide the service to the Internet.

1. In the Port Forwarding menu, click the

Add

button below the

Predefined Service Table

.

The Predefined Service menu appears (see Figure 19).

2. Complete the fields in the Predefined Service menu (see Table 7). (Or click

Back

to return

to the Port Forwarding Settings menu or

Cancel

to cancel any selections you made.)

3. Click

Apply

. The Port Forwarding menu reappears, with the predefined service you

configured shown in the

Predefined Service Table

.

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Configuring Your Gateway

4. To configure additional services (up to 100, including customer-defined services), repeat

steps 1 through 3. When you finish, click

Apply

in the LAN Settings menu to save your

settings.

5. To change the settings for a predefined service, click the radio button to the left of the

service you want to change and click the

Edit

button. When the Predefined Service menu

appears, edit the settings as necessary (see Table 7) and click

Apply

. Click

Apply

in the

LAN Settings menu to save your settings.

6. To delete a predefined service, click the radio button to the left of the service you want to

delete and click the

Delete

button. No precautionary message appears before you delete a

predefined service. Click

Apply

in the LAN Settings menu to save your settings.

Figure 25. Predefined Service Menu

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Configuring Your Gateway

Table 12. Predefined Service Menu Options

Option

Description

Service

List of predefined services from which you can choose.

LAN Server IP

IP address of the LAN PC or server that is running the service.

Remote IPs

Forwards the service to any remote IP address, one remote IP address, or a range of remote IP

addresses.

Start IP

To forward to:

•

A single remote IP address, enter the remote IP address.

•

A range of remote IP addresses, enter the starting IP address here and the ending IP address

range in the next field.

This field is unavailable if the Gateway is configured for any remote IP addresses.

End IP

Enter the ending IP address in the remote IP address range. This field is unavailable if the Gateway

is configured for any remote IP addresses or for a single remote IP address.

Adding a Port Forwarding Entry for a Customer-Defined Service

Using the following procedure, you can define special application services you want to

provide to the Internet. The following example shows how to set port forwarding for a Web

server on an Internet connection, where port 80 is blocked from the WAN side, but port 8000

is available.

Name:

Web Server

Type:

TCP

LAN Server IP:

192.168.0.100

Remote IPs:

Any (allow access to any public IP)

Public Port:

8000

Private Port:

80

With this configuration, all HTTP (Web) TCP traffic on port 8000 from any IP address on the

WAN side is redirected through the firewall to the Internal Server with the IP address

192.168.0.100 on port 80.

To create your own customized port-forwarding rules:

1. In the Port Forwarding menu, click the

Add

button below the

Customer Defined Service

Table

. The Customer Defined Service menu appears (see Figure 26).

2. Complete the fields in the Customer Defined Service menu (see Table 10). (Or click

Back

to return to the Port Forwarding Settings menu or

Cancel

to cancel any selections you

made.)

3. Click

Apply

. The Port Forwarding menu reappears, with the predefined service you

configured shown in the

Customer Defined Service Table

.

4. To configure additional services (up to 100, including predefined services), repeat steps 1

through 3. When you finish, click

Apply

in the LAN Settings menu to save your settings.

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SMCD3GN Wireless Cable Modem Gateway User Manual