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3.2 Call Control and PPP/MP Setup

Some applications require that the router (only for the

i

models) be remotely activated, or be

able to dial up to the ISP via the ISDN interface. Vigor routers provide this feature which

allows you to make a phone call to the router and then ask it to dial up to the ISP. Accordingly,

you can access your remote network to retrieve resources. Of course, you should have a fixed

IP address and expose some internal network resources to the outside world, such as FTP,

WWW and so on.

Note:

Call Control and PPP/MP are only available for the models of Vigor2900VGi

and Vigor2900Vi equipped with the ISDN interface.

Click

Call Control and PPP/MP Setup

from

Advanced Setup

group.

Note:

Please set

Dialing to a Single ISP

first before configuring this web page.

Dial Retry

It specifies the dial retry counts per triggered packet. A

triggered packet is the packet whose destination is outside the

local network. The default setting is no dial retry. If set to 5, for

each triggered packet, the router will dial 5 times until it is

connected to the ISP or remote access router.

Dial Delay Interval

It specifies the interval between dialup retries. By default, the

interval is 0 second.

Remote Activation

It specifies a phone number in the

Remote Activation

field to

enable the remote activation function. If the router accepts a call

from the number 12345678, it will terminate the incoming call

immediately and dial to the ISP.

Link Type

Because ISDN has two B channels (64Kbps/per channel), you

can specify whether you would like to have single B channel,

two B channels or BOD (Bandwidth on Demand). Four options

are available: Link Disable, Dialup 64Kbps, Dialup 128Kbps,

Dialup BOD.

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56

PPP Authentication

It specifies the PPP authentication method for PPP/MP

connections. Normally you can set it to

PAP/CHAP

for better

compatibility.

TCP Header Compression

VJ Compression

- It is used for TCP/IP protocol header

compression. Normally it is set to

None

to improve bandwidth

utilization.

Idle Timeout

Because our IDSN link type is “Dial On Demand”, the

connection will be initiated only when needed.

High Water Mark and

High Water Time

BOD stands for bandwidth-on-demand for Multiple-Link PPP

(ML-PPP or MP).

High Water Mark/ High Water Time/

Low Water Mark/Low Water Time

parameters are applied

when you set the

Link Type

to

Dialup BOD

. The ISDN

usually uses one B channel to access the Internet or remote

network when you choose the Dialup BOD link type. The

router will use the parameters here to decide on when you

activate/drop the additional B channel. Note that

cps

(characters-per-second) measures the total link utilization.

These parameters specify the situation in which the second

channel will be activated. With the first connected channel, if

its utilization exceeds the High Water Mark and such a

channel is being used over the High Water Time, the

additional channel will be activated. Thus, the total link speed

will be 128kbps (two B channels).

Low Water Mark and Low

Water Time

These parameters specify the situation in which the second

channel will be dropped. In terms of the two B channels, if

their utilization is under the Low Water Mark and these two

channels are being used over the High Water Time, the

additional channel will be dropped. As a result, the total link

speed will be 64kbps (one B channel).

Note:

If you are not sure whether your ISP can support BOD and/or ML-PPP’s

features, please seek assistance from your ISP, local dealers or our website:

.

3.3 Call Schedule Setup

The Vigor router has a built-in real time clock which can update itself manually or

automatically by means of Network Time Protocols (NTP). As a result, you can not only

schedule the router to dialup to the Internet at a specified time, but also restrict Internet access

to certain hours so that users can connect to the Internet only during certain hours, say,

business hours. The schedule is also applicable to other functions.

You have to set your time before set schedule. In the

System Management

group, select

Time and Date

to open the time setup page, press

Inquire Time

button to set the Vigor

router’s clock to current time of your PC. The clock will reset once if you power down or reset

the router. There is another way to set up time. You can inquiry an NTP server (a time server)

on the Internet to synchronize the router’s clock. This method can only be applied when the

WAN connection has been built up.

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57

Index

Click the number below Index to access into the setting page of

schedule.

Status

Display if this schedule setting is active or inactive.

You can set up to 15 schedules. Then you can apply them to your

Internet Access

or

VPN

and Remote Access >> LAN-to-LAN

settings.

To add a schedule, please click any index, say Index No. 1. The detailed settings of the call

schedule with index 1 are shown below.

Enable Schedule Setup

Check to enable the schedule.

Start Date (yyyy-mm-dd)

Specify the starting date of the schedule.

Start Time (hh:mm)

Specify the starting time of the schedule.

Duration Time (hh:mm)

Specify the duration (or period) for the schedule.

Action

Specify which action Call Schedule should apply during the

period of the schedule.

Force On -

Force the connection to be always on.

Force Down -

Force the connection to be always down.

Enable Dial-On-Demand -

Specify the connection to be

dial-on-demand and the value of idle timeout should be

specified in

Idle Timeout

field.

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Disable Dial-On-Demand -

Specify the connection to be up

when it has traffic on the line. Once there is no traffic over idle

timeout, the connection will be down and never up again during

the schedule.

Idle Timeout

Specify the duration (or period) for the schedule.

How often

Specify how often the schedule will be applied.

Once -

The schedule will be applied just once

Weekdays -

Specify which days in one week should perform the

schedule.

Example

Suppose you want to control the PPPoE Internet access connection to be always on (Force On)

from 9:00 to 18:00 for whole week. Other time the Internet access connection should be

disconnected (Force Down).

Office

Hour:

(Force On)

Mon - Sun

9:00 am

to

6:00 pm

1.

Make sure the PPPoE connection and

Call Schedule Setup

is working properly.

2.

Configure the PPPoE always on from 9:00 to 18:00 for whole week.

3.

Configure the

Force Down

from 18:00 to next day 9:00 for whole week.

Assign these two profiles to the PPPoE Internet access profile. Now, the PPPoE Internet

connection will follow the schedule order to perform

Force On

or

Force Down

action

according to the time plan that has been pre-defined in the schedule profiles.

3.4 NAT Setup

Usually, the router serves as an NAT (Network Address Translation) router. NAT is a

mechanism that one or more private IP addresses can be mapped into a single public one.

Public IP address is usually assigned by your ISP, for which you may get charged. Private IP

addresses are recognized only among internal hosts.

When the outgoing packets destined to some public server on the Internet reach the NAT

router, the router will change its source address into the public IP address of the router, select

the available public port, and then forward it. At the same time, the router shall list an entry in

a table to memorize this address/port-mapping relationship. When the public server response,

the incoming traffic, of course, is destined to the router’s public IP address and the router will

do the inversion based on its table. Therefore, the internal host can communicate with external

host smoothly.

The benefit of the NAT includes:

z

Save cost on applying public IP address and apply efficient usage of IP address.

NAT allows the internal IP addresses of local hosts to be translated into one public IP

address, thus you can have only one IP address on behalf of the entire internal hosts.

z

Enhance security of the internal network by obscuring the IP address.

There are

many attacks aiming victims based on the IP address. Since the attacker cannot be aware

of any private IP addresses, the NAT function can protect the internal network.

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59

On NAT page, you will see the private IP address defined in RFC-1918. Usually we

use the 192.168.1.0/24 subnet for the router. As stated before, the NAT facility can

map one or more IP addresses and/or service ports into different specified services.

In other words, the NAT function can be achieved by using port mapping methods.

Click

NAT Setup

on the

Advanced Setup

page. The setting items for NAT will be shown as

below.

3.4.1 Configure Port Redirection Table

Port Redirection

is

usually set up for server related service inside the local network (LAN),

such as web servers, FTP servers, E-mail servers etc. Most of the case, you need a public IP

address for each server and this public IP address/domain name are recognized by all users.

Since the server is actually located inside the LAN, the network well protected by NAT of the

router, and identified by its private IP address/port, the goal of Port Redirection function is to

forward all access request with public IP address from external users to the mapping private IP

address/port of the server.

The port redirection can only apply to incoming traffic.

To use this function, please go to

NAT

page and choose

Port

Redirection

web page. The

Port Redirection Table

provides 10 port-mapping entries for the internal hosts.