ZyXEL Communications P-663HN-51 Manual

P-663HN-51 Support Notes
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All contents copyright © 2009 ZyXEL Communications Corporation.
P-663HN-51
802.11n ADSL2+ Bonded 4-Port Gateway
Support Notes
Version 3.70
Jul. 2009

P-663HN-51 Support Notes
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All contents copyright © 2009 ZyXEL Communications Corporation.
FAQ................................................................................... 5
General FAQ.............................................................................6
1.How do I access the P-663HN-51 Command Line Interface (CLI)?.......6
2.How do I update the firmware and configuration file?............................6
3. How do I upgrade/backup the firmware by using TFTP client program
via LAN?...................................................................................................6
4. How do I restore P-663HN-51 configurations by using TFTP client
program via LAN?.....................................................................................6
5. What should I do if I forget the system password? ...............................7
6. How to use the Reset button?...............................................................7
7. What is NAT virtual server? When should I use NAT virtual server?....7
8. What is NAT Port Triggering?...............................................................8
9. When should I use NAT Port Triggering? .............................................8
10. How many network users can the NAT support?................................8
Product FAQ.............................................................................8
1. How can I manage P-663HN-51?.........................................................8
2. What is the default password for Web Configurator?............................9
3. What’s the difference between ‘Common User Account’ and
‘Administrator Account’? ...........................................................................9
4. How do I know the P-663HN-51's WAN IP address assigned by the ISP?
...................................................................................................9
5. What is the micro filter or splitter used for?...........................................9
6. The P-663HN-51 supports five types of network protocol for IP over
Ethernet as WAN interface, what's the difference between MER(MAC
Encapsulation Routing) and Bridge? ......................................................10
7. How do I know I am using PPPoE? ....................................................10
8. Why does my provider use PPPoE?...................................................10
9. What is DDNS?...................................................................................10
10. When do I need DDNS service?.......................................................11
11. What is DDNS wildcard? Does the P-663HN-51 support DDNS
wildcard?.................................................................................................11
12. What is Traffic Shaping?...................................................................11
13. Why do we perform traffic shaping in the P-663HN-51?...................12
14. What do the parameters (PCR, SCR, MBS) mean? .........................12
15. What do the ATM QoS Types (CBR, UBR, VBR-nRT, VBR-RT) mean?
.................................................................................................12
16. What is IP filtering?...........................................................................13
17. Can the P-663HN-51's handle IPSec packets sent by the IPSec
gateway? ................................................................................................13

P-663HN-51 Support Notes
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18. How do I setup my P-663HN-51 for routing IPSec packets over NAT?
.................................................................................................13
ADSL FAQ...............................................................................14
1. How does ADSL compare to Cable modems?....................................14
2. What is the expected throughput? ......................................................15
3. What is the microfilter used for? .........................................................15
4. How do I know the ADSL line is up?...................................................15
5. How does the P-663HN-51 work on a noisy ADSL?...........................15
6. Does the VC-based multiplexing perform better than the LLC-based
multiplexing?...........................................................................................15
7. How do I know the details of my ADSL line statistics?........................16
8. What are the signaling pins of the ADSL connector?..........................16
9. How do I use single DSL line?............................................................17
Firewall FAQ...........................................................................18
General....................................................................................18
1. What is a network firewall?.................................................................18
2. What makes P-663HN-51 secure?.....................................................18
3. What are the basic types of firewalls? ................................................18
4. Why do you need a firewall when your router has packet filtering and
NAT built-in?...........................................................................................19
5. What is Denials of Service (DoS) attack?...........................................19
6. What is Ping of Death attack?.............................................................19
7. What is Teardrop attack?....................................................................20
8. What is SYN Flood attack?.................................................................20
9. What is LAND attack?.........................................................................20
10. What is Brute-force attack?...............................................................20
11. What is IP Spoofing attack?..............................................................21
Configuration..........................................................................22
1. How do I configure the firewall?..........................................................22
2. How do I control some PC’s time of accessing to Internet?................22
3. Why can't I configure my P-663HN-51 using Web Configurator/Telnet
over WAN? .............................................................................................23
4. Why can't I upload the firmware and configuration file using FTP over
WAN? .................................................................................................24
Log and Alert.......................................................................................25
1. When does the P-663HN-51 generate the firewall log?......................25
2. What does the log show to us?...........................................................26
3. When does the P-663HN-51 generate the firewall alert?....................26
4. What is the difference between the log and alert?..............................26
Wireless FAQ..........................................................................27

P-663HN-51 Support Notes
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All contents copyright © 2009 ZyXEL Communications Corporation.
General FAQ.......................................................................................27
1. What is a Wireless LAN?....................................................................27
2. What are the advantages of Wireless LAN?.......................................27
3. What is the disadvantage of Wireless LAN?.......................................28
4. Where can you find 802.11 wireless networks?..................................28
5. What is an Access Point?...................................................................28
6. Is it possible to use wireless products from a variety of vendors? ......28
7. What is Wi-Fi? ....................................................................................28
8. What types of devices use the 2.4GHz Band?....................................28
9. Does the 802.11 interfere with Bluetooth device?...............................29
10. Can radio signals pass through wall? ...............................................29
11. What are potential factors that may causes interference among WLAN
products?................................................................................................29
12. What's the difference between a WLAN and a WWAN?...................30
13. Can I manually swap the wireless module without damage any
hardware?...............................................................................................30
14. What wireless security mode does P-663HN-51 support?................30
15. What Wireless standard does P-663HN-51 support?.......................30
16. Does P-663HN-51 support MAC filtering?........................................30
17. Does P-663HN-51 support auto rate adaption?................................30
Advanced FAQ .......................................................................31
1. What is Ad Hoc mode?.......................................................................31
2. What is Infrastructure mode?..............................................................31
3. How many Access Points are required in a given area?.....................31
4. What is Direct-Sequence Spread Spectrum Technology –(DSSS)?..31
5. What is Frequency-hopping Spread Spectrum Technology –(FHSS)?..
.................................................................................................31
6. Do I need the same kind of antenna on both sides of a link? .............32
7. Why the 2.4 GHZ Frequency range?..................................................32
8. What is Server Set ID (SSID)?............................................................32
9. What is an ESSID?.............................................................................32
Security FAQ ..........................................................................33
1. How do I secure the data across the P-663HN-51 Access Point's radio
link? .................................................................................................33
2. What is WEP?.....................................................................................33
3. What is WPA-PSK?............................................................................33
4. What is the difference between 40-bit and 64-bit WEP?.....................33
5. What is a WEP key?...........................................................................34
6. Will 128-bit WEP communicate with 64-bit WEP?..............................34
7. Can the SSID be encrypted?..............................................................34

P-663HN-51 Support Notes
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8. By turning off the broadcast of SSID, can someone still sniff the SSID?
.................................................................................................34
9. What are Insertion Attacks?................................................................34
10. What is Wireless Sniffer?..................................................................34
Application Notes...................................................................36
General Application Notes...................................................................36
1. Internet Access Using P-663HN-51 under Bridge mode.....................36
2. Internet Access Using P-663HN-51 under Routing mode...................41
3. Setup the P-663HN-51 as a DHCP Relay ..........................................45
4. Using the Dynamic DNS (DDNS)........................................................46
5. Using syslog .......................................................................................48
6. Using IP Alias .....................................................................................49
7. Using Static Route..............................................................................50
8. RIP .................................................................................................51
9. Using IGMP Multicast .........................................................................53
10. About Certificates .............................................................................53
11. Interface Group.................................................................................54
12. Change WAN MTU via WEB-GUI.....................................................54
Wireless Application Notes..................................................................56
1. Configure a Wireless Client to Ad hoc mode ......................................56
2. MAC Filter...........................................................................................61
3. IEEE 802.11n......................................................................................62
4. Site Survey .........................................................................................63
5. Configure 802.1x and WPA ................................................................66
6. The WPS/WLAN Button......................................................................71
7. What’s the difference between IEEE802.11a/b/g/n?...........................72
Support Tool...........................................................................73
1. LAN/WAN Packet Trace .....................................................................73
2. Firmware/Configurations Uploading and Downloading using TFTP....78
3. Using FTP to Upload the Firmware and Configuration Files...............81
Command Syntax and General User Interface.....................84
FAQ

P-663HN-51 Support Notes
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All contents copyright © 2009 ZyXEL Communications Corporation.
General FAQ
1. How do I access the P-663HN-51 Command Line Interface (CLI)?
The Command Line Interface is for the Administrator use only, and it could be
accessed via telnet session.
Note: It is protected by super password, ‘1234’by factory default.
2. How do I update the firmware and configuration file?
You can do this if you access the P-663HN-51 as Administrator. You can
upload the firmware and configuration file to Prestige from Web Condigurator,
or using FTP or TFTP client software. You CAN NOT upload the firmware and
configuration file via Telnet because the Telnet connection will be dropped
during uploading the firmware. Please do not power off the router right after the
FTP or TFTP uploading is finished, the router will upload the firmware to its
flash at this moment.
Note: There may be firmware that could not be upgraded from Web
Configurator. In this case, ZyXEL will prepare special Upload Software
for you. Please read the firmware release note carefully when you want to
upload a new fireware.
3. How do I upgrade/backup the firmware by using TFTP client program
via LAN?
The P-663HN-51 allows you to transfer the firmware to P-663HN-51 using
TFTP program via LAN. The procedure for uploading firmware via TFTP is as
follows.
a. Use the TELNET client program in your PC to login to your
P-663HN-51.
b. Enter CI command 'sys stdio 0' to disable Stdio idle timeout
c. To upgrade firmware, use TFTP client program to put firmware in file
'ras' in the Prestige. After data transfer is finished, the P-663HN-51 will
program the upgraded firmware into FLASH ROM and reboot itself.
d. To backup your firmware, use the TFTP client program to get file 'ras'
from the Prestige.
4. How do I restore P-663HN-51 configurations by using TFTP client
program via LAN?
a. Use the TELNET client program in your PC to login to your
P-663HN-51.

P-663HN-51 Support Notes
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All contents copyright © 2009 ZyXEL Communications Corporation.
b. Enter CI command 'sys stdio 0' disable Stdio idle timeout
c. To backup the P-663HN-51 configurations, use TFTP client program to
get file 'rom-0' from the P-663HN-51.
d. To restore the P-663HN-51 configurations, use the TFTP client program
to put your configuration in file rom-0 in the P-663HN-51.
5. What should I do if I forget the system password?
In case you forget the system password, you can erase the current
configuration and restore factory defaults this way:
Use the RESET button on the rear panel of P-663HN-51 to reset the router.
After the router is reset, the LAN IP address will be reset to '192.168.1.1', the
common user password will be reset to 'user', the Administrator password will
be reset to ‘1234’.
6. How to use the Reset button?
a. Turn your P-663HN-51 on. Make sure the POWER led is on (not
blinking)
b. Press the RESET button for longer than one second and shorter than
ten seconds and release it.
c. Press the RESET button for ten seconds and then release it. If the
POWER LED begins to blink, the default configuration has been
restored and the P-663HN-51 restarts.
7. What is NAT virtual server? When should I use NAT virtual server?
NAT virtual server (port forwarding) entries are to have the P-663HN-51
forward traffic from the WAN to LAN computers.
You might do this to get particular games or services to work through NAT.
You can also make servers, for example, web or FTP, visible to the outside
world even though NAT makes your whole inside network appear as a single
computer to the outside world.
You may enter a single port number or a range of port numbers to be
forwarded, and the local IP address of the desired server. The port number
identifies a service; for example, web service is on port 80 and FTP on port 21.
In some cases, such as for unknown services or where one server can support
more than one service (for example: both FTP and web service), it might be

P-663HN-51 Support Notes
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All contents copyright © 2009 ZyXEL Communications Corporation.
better to specify a range of port numbers. You can allocate a server IP address
that corresponds to a port or a range of ports.
8. What is NAT Port Triggering?
Trigger port forwarding allows computers on the LAN to dynamically take turns
using port forwarding service. P-663HN-51 records the IP address of a LAN
computer that sends traffic to the WAN to request a service with a specific port
number and protocol (a "trigger" port).
When P-663HN-51's WAN port receives a response with a specific port
number and protocol ("incoming" port), it forwards the traffic to the LAN IP
address of the computer that sent the request. After that computer’s
connection for that service closes, another computer on the LAN can use the
service in the same manner. This way you do not need to configure a new IP
address each time you want a different LAN computer to use the application.
9. When should I use NAT Port Triggering?
Some services use a dedicated range of ports on the client side and a
dedicated range of ports on the server side. With regular port forwarding you
set a forwarding port in NAT to forward a service (coming in from the server on
the WAN) to the IP address of a computer on the client side (LAN).
The problem is that port forwarding only forwards a service to a single LAN IP
address. In order to use the same service on a different LAN computer, you
have to manually replace the LAN computer's IP address in the forwarding port
with another LAN computer's IP address.
10. How many network users can the NAT support?
P-663HN-51 do limit the number of the sessions. It can support 3960 sessions
that you can use.
Product FAQ
1. How can I manage P-663HN-51?
Multilingual Embedded Web GUI for Local and Remote management

P-663HN-51 Support Notes
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CLI (Command-line interface)
Telnet support (Administrator Password Protected ) for remote
configuration change and status monitoring
FTP/ TFTP sever, firmware upgrade and configuration backup and
restore are supported(Administrator Password Protected)
2. What is the default password for Web Configurator?
There are two different accounts for P-663HN-51 Web Configurator: Common
User Account and Administrator Account.
By factory default the password for the two accounts are:
Common User Account: user
Administrator Account: 1234.
You can change the password after you logging in the Web Configurator.
Please record your new password whenever you change it. The system
will lock you out if you have forgotten your password.
3. What’s the difference between ‘Common User Account’and
‘Administrator Account’?
For Common User Account, it can only access the status monitor of
P-663HN-51 and check the current system status.
For Administrator Account, besides accessing the status monitor of
P-663HN-51, it can also access Wizard setup/ Advanced setup of
P-663HN-51:
Moreover, only with Administrator Password, you could manage the
P-663HN-51 via FTP/TFTP or Telnet.
4. How do I know the P-663HN-51's WAN IP address assigned by the ISP?
You can view Device Info>>WAN, IP address is shown in WAN Info>>IPv4
Address.
5. What is the micro filter or splitter used for?
Generally, the voice band uses the lower frequency ranging from 0 to 4KHz,
while ADSL data transmission uses the higher frequency. The micro filter acts
as a low-pass filter for your telephone set to ensure that ADSL transmissions
do not interfere with your voice transmissions. For the details about how to
connect the micro filter please refer to the user's manual.

P-663HN-51 Support Notes
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All contents copyright © 2009 ZyXEL Communications Corporation.
6. The P-663HN-51 supports five types of network protocol for IP over
Ethernet as WAN interface, what's the difference between MER(MAC
Encapsulation Routing) and Bridge?
When the ISP limits some specific computers to access Internet, that means
only the traffic to/from these computers will be forwarded and the other will be
filtered. In this case, we use bridge mode which works as an ADSL modem to
connect to the ISP. The ISP will generally give one Internet account and limit
only one computer to access the Internet.
For most Internet users having multiple computers want to share an Internet
account for Internet access, they have to add another Internet sharing device,
like a router. In this case, we use the router mode which works as a general
Router plus an ADSL Modem.
7. How do I know I am using PPPoE?
PPPoE requires a user account to login to the provider's server. If you need to
configure a user name and password on your computer to connect to the ISP
you are probably using PPPoE. If you are simply connected to the Internet
when you turn on your computer, you probably are not. You can also check
your ISP or the information sheet given by the ISP. Please choose PPPoE as
the encapsulation type in the P-663HN-51 if the ISP uses PPPoE.
8. Why does my provider use PPPoE?
PPPoE emulates a familiar Dial-Up connection. It allows your ISP to provide
services using their existing network configuration over the broadband
connections. Besides, PPPoE supports a broad range of existing applications
and service including authentication, accounting, secure access and
configuration management.
9. What is DDNS?
The Dynamic DNS service allows you to alias a dynamic IP address to a static
hostname, allowing your computer to be more easily accessed from various
locations on the Internet. To use the service, you must first apply an account
from several free Web servers such as http://www.dyndns.org/.
Without DDNS, we always tell the users to use the WAN IP of the P-663HN-51
to reach our internal server. It is inconvenient for the users if this IP is dynamic.
With DDNS supported by the P-663HN-51, you apply a DNS name (e.g.,