66

Use RADIUS Server

RADIUS servers allow external authentication of users by means of a remote authentica-

tion database. The remote authentication database is maintained by a Remote Authentica-

tion Dial-In User Service (RADIUS) server. In conjunction with Wireless User Authentication,

you can use a RADIUS server database to authenticate users seeking access to the wire-

less services, as well as the authorized user list maintained locally within the Gateway.

If you click the

link, the screen expands to allow you to enter your RADIUS server

information.

•

RADIUS Server Addr/Name:

The default RADIUS server name or IP address that you

want to use.

•

RADIUS Server Secret:

The RADIUS secret key used by this server. The shared secret

should have the same characteristics as a normal password.

•

RADIUS Server Port:

The port on which the RADIUS server is listening, typically, the

default 1812.

Click the

button.

You can also configure alternate RADIUS servers from the Advanced Network Configuration

page, by clicking the

link.

67

Configure

The

Advanced Network Configuration

page appears.

You access the RADIUS Server configuration screen from the Advanced Network Configura-

tion web page, by clicking the

link.

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WAN IP Interfaces

Your IP interfaces are listed. Click on an interface to configure it.

IP Gateway

Enable Gateway:

You can configure the Gateway to send packets to a default gateway

if it does not know how to reach the destination host.

Interface Type:

If you have PPPoE enabled, you can specify that packets destined for

unknown hosts will be sent to the gateway being used by the remote PPP peer. If you

select ip-address, you must enter the IP address of a host on a local or remote network

to receive the traffic.

Default Gateway:

The IP Address of the default gateway.

Other WAN Options

PPPoE:

You can enable or disable PPPoE. This link also allows configuration of NAT,

admin restrictions, PPPoE username/password, and connection type.

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Configure

ATM Circuits:

You can configure the ATM circuits and the number of Sessions. The IP

Interface(s) should be reconfigured after making changes here.

Netopia Firmware Version 7 supports VPI/VCI autodetection by default. If VPI/VCI auto-

detection is enabled, the ATM Circuits page displays VPI/VCI = 0. If you configure a new

ATM VPI/VCI pair, upon saving and restarting, autodetection is disabled and only the

new VPI/VCI pair configuration will be enabled.

VPI/VCI Autodetection consists of eight static VPI/VCI pair configurations. These are 0/

35, 8/35, 0/32, 8/32, 1/35, 1/1, 1/32, 2/32. These eight VPI/VCI pairs will be cre-

ated if the Gateway is configured for autodetection. the Gateway does not establish a

circuit using any of these preconfigured VPI/VCI pairs, then you can manually enter a

VPI/VCI pair in the ATM Circuits page.

ATM Traffic Shaping:

You can prioritize delay-sensitive data by configuring the Quality

of Service (QoS) characteristics of the virtual circuit. Click the

link.

Available Encapsulation types:

Available Multiplexing types:

PPP over Ethernet (PPPoE)

LLC/SNAP

PPP over ATM (PPPoA)

VC muxed

RFC-1483 Bridged Ethernet

RFC-1483 Routed IP

None

70

You can choose UBR (Unspecified Bit Rate), CBR (Constant Bit Rate), or VBR (Variable

Bit Rate) from the pull-down menu and set the Peak Cell Rate (PCR) in the editable field.

UBR (Unspecified Bit Rate)

guarantees no minimum transmission rate. Cells are

transmitted on a “best effort” basis. However, there is a cap on the maximum transmis-

sion rate for UBR VCs. In a practical situation:

• UBR VCs should be transmitted at a priority lower than CBR.

• Bandwidth should be shared equally among UBR VCs.

UBR applications are non-real-time traffic such as IP data traffic.

CBR (Constant Bit Rate)

guarantees a certain transmission rate (although the appli-

cation may underutilize this bandwidth). A Peak Cell Rate (PCR) characterizes CBR. CBR

is most suited for real time applications such as real time voice / video, although it can

be used for other applications.

VBR (Variable Bit Rate)

This class is characterized by:

• a

Peak Cell Rate

(PCR), which is a temporary burst, not a sustained rate, and

• a

Sustained Cell Rate

(SCR),

• a Burst Tolerance (BT), specified in terms of

Maximum Burst Size

(MBS). The MBS

is the maximum number of cells that can be transmitted at the peak cell rate and

should be less than, or equal to the Peak Cell Rate, which should be less than, or equal

to the line rate.

VBR has two sub-classes:

a.

VBR non-real-time (VBR-nrt): Typical applications are non-real-time traffic, such as IP

data traffic. This class yields a fair amount of Cell Delay Variation (CDV).

b.

VBR real time (VBR-rt): Typical applications are real-time traffic, such as compressed

voice over IP and video conferencing. This class transmits cells with a more tightly

bounded Cell Delay Variation. The applications follow CBR.