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VoIP/(802.11g) ADSL2+ (VPN) Firewall Router
Chapter 4: Configuration
50
Authentication Protocol:
Default is Chap(Auto). Your ISP will advise you whether to use Chap or Pap.
Connection:
~
Always on:
If you want the router to establish a PPPoE session when starting up and to
automatically re-establish the PPPoE session when disconnected by the ISP.
~
Connect on Demand:
If you want to establish a PPPoE session only when there is a packet
requesting access to the Internet (i.e. when a program on your computer attempts to access the
Internet).
Idle Timeout:
Auto-disconnect the broadband firewall gateway when there is no activity on the line for a
predetermined period of time.
~
Detail:
You can define the destination port and packet type (TCP/UDP) without checking by
timer. It allows you to set which outgoing traffic will not trigger and reset the idle timer.
RIP:
RIP v1, RIP v2, and RIP v2 Multicast. Check to enable RIP function.
MTU:
Maximum Transmission Unit. The size of the largest datagram (excluding media-specific headers)
that IP will attempt to send through the interface.
Advanced Options (PPPoE)
LLC Header:
Selects encapsulation mode, true for using LLC or false for using VC-Mux.
Create Route:
This setting specifies whether a route is added to the system after IPCP (Internet Protocol
Control Protocol) negotiation is completed. If set to
enabled
, a route will be created which directs packets
to the remote end of the PPP link.
Specific Route:
Specifies whether the route created when a PPP link comes up is a specific or default
route. If set to
enabled
, the route created will only apply to packets for the subnet at the remote end of the
PPP link. The address of this subnet is obtained during IPCP negotiation.
Subnet Mask:
sets the subnet mask used for the local IP interface connected to the PPP transport. If the
value
0.0.0.0
is supplied, the netmask will be calculated from the class of the IP address obtained during
IPCP negotiation.
Route Mask:
Sets the subnet mask used by the route that is created when a PPP link comes up. If it is
set to
0.0.0.0
, the subnet mask is determined by the IP address of the remote end of the link. The class of
the IP address is obtained during IPCP (Internet Protocol Control Protocol) negotiation.
MRU:
Maximum Receive Unit. This is negotiated during the LCP protocol stage.
Discover Primary / Secondary DNS:
This setting enables/disables whether the primary/secondary DNS
server address is requested from a remote PPP peer using IPCP. The default setting for this command is
enabled
.
Give DNS to Relay:
Controls whether the PPP Internet Protocol Control Protocol (IPCP) can request the
DNS server IP address for a remote PPP peer. Once IPCP has discovered the DNS server IP address, it
automatically gives the address to the local DNS relay so that a connection can be established.
Give DNS to Client:
Controls whether the PPP Internet Protocol Control Protocol (IPCP) can request a
DNS server IP address for a remote PPP peer. Once IPCP has discovered the DNS server IP address, it
automatically gives the address to the local DNS client so that a connection can be established.
Give DNS to DHCP Server:
Similar to the above, but gives the DNS server address to the DHCP server.
Discover Primary NBNS / Discover Secondary NBNS:
This setting enables/disables whether the
primary/secondary NBNS server address is requested from a remote PPP peer using IPCP. The default
setting for this command is disabled.
Discover Subnet Mask:
Specifies if the subnet mask given by IPCP negotiation process is to be used.
Give Subnet Mask To DHCP Server:
Enable to change your DHCP Server settings by using the given
information in IPCP negotiation process.
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Chapter 4: Configuration
51
DNS
A Domain Name System (DNS) contains a mapping table for domain name and IP addresses. On the
Internet, every host has a unique and user-friendly name (domain name) such as www.helloworld.com
and an IP address. An IP address is a 32-bit number in the form of
xxx.xxx.xxx.xxx
, for example
192.168.1.254. You can think of an IP address as a telephone number for devices on the Internet, and the
DNS will allow you to find the telephone number for any particular domain name. As an IP Address is hard
to remember, the DNS converts the friendly name into its equivalent IP Address.
You can obtain a Domain Name System (DNS) IP address automatically if your ISP has provided it when
you logon, check the
Enable
box. Usually when you choose PPPoE or PPPoA as your WAN - ISP
protocol, the ISP will provide the DNS IP address automatically. You may leave the configuration field
blank.
Alternatively, your ISP may provide you with an IP address of their DNS. If this is the case, you must enter
the DNS IP address manually.
If you choose one of the other three protocols
RFC1483 Routed/Bridged and IPoA check with your ISP,
it may provide you with an IP address for their DNS server. You must enter the DNS IP address if you set
the DNS of your PC to the LAN IP address of this router.
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Chapter 4: Configuration
52
ADSL
Connect Mode:
This mode will automatically detect your ADSL line code, ADSL2+, ADSL2, G.dmt,
G.lite, T1.413, AnnexM2 and AnnexM2+. But in some area, multimode cannot detect the ADSL line code
well. If it is the case, please adjust the ADSL line code to G.dmt or T1.413 first. If it still fails, please try the
other values such as ALCTL, ADI, etc.
If you still having trouble with the line, please check with your ISP
for line connect information.
Note:
If you have subscribed ADSL1 T1.413 mode line, you may go to the Advanced Options for more connection
module combinations.
Activate Line:
Aborting (false) your ADSL line and making it active (true) again for taking effect with
setting of
Connect Mode
.
Coding Gain:
It reduces router’s transmit power which will effect to router’s downstream performance.
Higher the gain will increase the downstream rate but it sometimes causes unstable ADSL line. The
configurable ADSL coding gain is from 0 dB to 7dB, or automatic.
Tx Attenuation:
It is the ADSL transmission power that the modem is using. The lower the power the
better performance in router’s upstream.
Configurable value is between 0~12.
DSP Firmware Version:
Current ADSL line code firmware version.
Connected:
Display current ADSL line sync status.
Operational Mode:
Display current ADSL mode standard (Operational Mode) your Router is using when
ADSL line has sync.
Annex Type:
ADSL Annex A, which works over a standard telephone line. Annex B, which works over an
ISDN line.
Upstream:
Display current upstream rate of your ADSL line.
Downstream:
Display current downstream rate of your ADSL line.
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VoIP/(802.11g) ADSL2+ (VPN) Firewall Router
Chapter 4: Configuration
53
Advanced Options
ADSL Parameters help to interpret your ADSL line statistics.
SNR Margin:
It is known as Signal to Noise Ration Margin. It is the relative of DSL strength to Noise ratio.
This margin is measured in decibels (dB).
Higher the dB figures better the DSL strength and better
chance to get faster speed. THE HIGHER THE BETTER
Line Attenuation:
it measures the signal loss in decibel (dB) between the CO DSLAM. Lower the
attenuation dB figures better the DSL strength/speed.
THE LOWER THE BETTER.
CRC Errors:
It is known as Cyclic Redundancy Check Error.
Its checksum is to detect the transmission
error.
Latency:
It includes two channels, Fast and Interleaved. It displays the channel adapted by your ISP.
Capability:
There are more combinational ADSL modulation modes to be selected.
~
GDMT:
ADSL connection will be limited to ADSL1 (G.DMT / G.Lite) only.
~
BIS+:
ADSL connection will be limited to ADSL2+ only. (If you are ADSL1 subscriber DO NOT
select this option).
~
BIS+/T1413:
ADSL connection will be limited to ADSL2+ and ADSL1 T1.413 only.
~
BIS+/BIS:
ADSL connection will be limited to ADSL2+ and ADSL2 only.
~
BIS+/BIS/GDMT/T1413:
ADSL connection will be limited to ADSL2+, ADSL2 and ADSL1
G.DMT & G.Lite & T1.413.
~
BIS+/BIS/T1413:
ADSL connection will be limited to ADSL2+, ADSL2 and T1.413.
~
BIS+/BIS/GDMT:
ADSL connection will be limited to ADSL2+, ADSL2 and ADS1 (G.DMT/G.Lite)
only.
~
DISABLE:
This disable function will disconnect your ADSL synch.
Select it with cautious.
S=1/2 Mode:
It is ADSL1 protocols which can increase the downstream speed up to 12Mpb.
Please
check further with your ISP about this option is being enabled or not.
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VoIP/(802.11g) ADSL2+ (VPN) Firewall Router
Chapter 4: Configuration
54
System
Here are the items within the
System
section:
Time Zone, Remote Access, Firmware Upgrade,
Backup/Restore, Restart
and
User Management.
Time Zone
The router does not have a real time clock on board; instead, it uses the Simple Network Time Protocol
(SNTP) to get the current time from an SNTP server outside your network. Choose your local time zone,
click
Enable
and click the
Apply
button. After a successful connection to the Internet, the router will
retrieve the correct local time from the SNTP server you have specified. If you prefer to specify an SNTP
server other than those in the list, simply enter its IP address as shown above. Your ISP may provide an
SNTP server for you to use.
Daylight Saving
is also known as
Summer Time Period.
Many places in the world
adapt it during
summer time to move one hour of daylight from morning to the evening in local standard time.
Check
Automatic
box to auto set your local time.
Resync Period
(in minutes) is the periodic interval the router will wait before it re-synchronizes the
router’s time with that of the specified SNTP server. In order to avoid unnecessarily increasing the load
on your specified SNTP server you should keep the poll interval as high as possible – at the absolute
minimum every few hours or even days.

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