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Page 61 / 173 Scroll up to view Page 56 - 60
Vigor2900 Series User’s Guide
55
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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Vigor2900 Series User’s Guide
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.
Page 63 / 173
Vigor2900 Series User’s Guide
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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Vigor2900 Series User’s Guide
58
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.
Page 65 / 173
Vigor2900 Series User’s Guide
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.

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