ZyXEL Communications P-660R-Tx Series Manual

P-660R-Tx Series
ADSL2+ Ethernet Router
Support Notes
Version 1.01
Mar. 2010
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All contents copyright © 2010 ZyXEL Communications Corporation.

P-660R-Tx Series Support Note
OS FAQ..............................................................................................................4
1. How do I access the P-660R-Tx Command Line Interface (CLI)?.............4
2. How do I update the firmware and configuration file ?...............................4
3. How do I restore P-660R-Tx configurations by using TFTP client program
via LAN?........................................................................................................5
4. What should I do if I forget the system password?....................................5
5. How to use the Reset button?...................................................................5
6. What is SUA? When should I use SUA?...................................................5
7. What is the difference between SUA and Full Feature NAT?....................6
8. Is it possible to access a server running behind SUA from the outside
Internet? How can I do it?..............................................................................6
9. When do I need select Multiple IP in NAT (Full Feature NAT)?.................6
10. What IP/Port mapping does Multi-NAT support?.....................................7
11. How many network users can the SUA/NAT support?............................8
12. How can I protect against IP spoofing attacks?.......................................8
Product FAQ ....................................................................................................9
1. How can I manage P-660R-Tx? ................................................................9
2. What is the default password for Web Configurator? ................................9
3. How do I know the P-660R-Tx's WAN IP address assigned by the ISP?..9
4. What is Traffic Shaping? ...........................................................................9
5. Why do we perform traffic shaping in the P-660R-Tx?..............................9
6. What do the parameters (PCR, SCR, and MBS) mean?.........................10
7. What do the ATM QoS Types (CBR, UBR, VBR, rtVBR, nrtVBR) mean?10
8. The P-660R-Tx supports Bridge and Router mode, what's the difference
between them?............................................................................................11
9. How do I know I am using PPPoE?.........................................................11
10. Why does my provider use PPPoE?......................................................11
11. When do I need to choose dynamic IP?................................................11
12. What is DDNS? .....................................................................................13
13. When do I need DDNS service?............................................................13
14. What is DDNS wildcard? Does the P-660R-Tx support DDNS wildcard?13
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P-660R-Tx Series Support Note
15. Can the P-660R-Tx's SUA (Simple IP) handle IPSec packets sent by the
IPSec gateway? ..........................................................................................14
16. How do I setup P-660R-Tx for routing IPSec packets over SUA?.........14
17. What is IP Policy Routing (IPPR)?.........................................................15
18. How does the IPPR work?.....................................................................16
19. What is CWMP?....................................................................................16
20. How to configure CWMP on P-660R-Tx?..............................................16
21. How to configure ACL?..........................................................................18
22. What is UPnP?......................................................................................19
ADSL FAQ.......................................................................................................20
1. How does ADSL compare to Cable modems? ........................................20
2. What is the micro-filter or splitter used for?.............................................20
3. How do I know the ADSL line is up?........................................................20
4. Does the VC-based multiplexing perform better than the LLC-based
multiplexing? ...............................................................................................20
5. How do I know the details of my ADSL line statistics? ............................21
6. What are the signaling pins of the ADSL connector? ..............................21
Application Notes .........................................................................................22
1. Internet Access Using P-660R-Tx under Bridge mode............................22
2. Internet Access Using P-660R-Tx under Routing mode..........................24
3. Make use of Bridge Interface in Routing mode........................................26
4. Setup the P-660R-Tx as a DHCP Relay..................................................27
5. SUA Notes...............................................................................................29
6. Using Full Feature NAT...........................................................................38
7. Using the Dynamic DNS (DDNS) ............................................................46
8. Network Management Using SNMP........................................................48
9. Using system log.....................................................................................50
10. Using IP Alias........................................................................................51
11. Using IP Multicast..................................................................................53
12. How to configure packet filter on P-660R-Tx?.......................................55
Support Tool..................................................................................................59
1. LAN/WAN Packet Trace..........................................................................59
CI Command Reference...............................................................................63
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P-660R-Tx Series Support Note
OS FAQ
1. How do I access the P-660R-Tx Command Line Interface (CLI)?
The Command Line Interface is for the administrator use only, and it could be
accessed via telnet session.
Begin telnet session:
(1) Choose “start”on your computer →“run”
(2) Input “cmd”and enter
(3) Input “telnet xxx.xxx.xxx.xxx”( note that there is a space between the two),
(4) Enter to login in the CLI.
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-660R-Tx as administrator. You can upload
the firmware and configuration file to P-660R-Tx from Web Configurator, or
using FTP 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 uploading is
finished, the router will upload the firmware to its flash at this moment.
(1) Update on web configuration page, Advanced Setup，
Maintenance -> Firmware
You can check your current firmware version and upgrade the firmware of
the Router in this page. Make sure the firmware you want to use is on the
local hard drive of the computer. Click on Browse to browse the local hard
drive and locate the firmware to be used for upgrade.
(2) Update firmware with FTP
a) Use the FTP client program in your PC to login to your P-660R-Tx.
Note that it is protected by username and password, “admin”and
“1234”by default.
b) To update firmware, you need to use the command: put xx.bin ras for
firmware or put xx.rom rom-0 for rom file.
xx.bin means the firmware on your local hard drive and xx.rom means
rom file on your local hard drive. You can simply draw them into the
window.
Note: There may be firmware that could not be upgraded from Web
Configurator. In this case, ZyXEL will prepare special Upload Software
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P-660R-Tx Series Support Notes
for you. Please read the firmware release note carefully when you want to
upload a new firmware.
3. How do I restore P-660R-Tx configurations by using TFTP client
program via LAN?
a. Use the TELNET client program in your PC to login to your P-660R-Tx.
b. Enter CI command 'sys stdio 0' disable Stdio idle timeout
c. To backup the P-660R-Tx configurations, use TFTP client program to
get file “rom-0”from the P-660R-Tx.
d. To restore the P-660R-Tx configurations, use the TFTP client
program to put your configuration in file rom-0 in the P-660R-Tx.
4. 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-660R-Tx to reset the router.
After the router is reset, the LAN IP address will be reset to '192.168.1.1', the
password will be reset to “1234”.
5. How to use the Reset button?
a. Turn your P-660R-Tx on. Make sure the POWER led is on (not
blinking)
b. 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-660R-Tx restarts.
6. What is SUA? When should I use SUA?
SUA (Single User Account) is a unique feature supported by P-660R-Tx router
which allows multiple people to access Internet concurrently for the cost of a
single user account.
When P-660R-Tx acting as SUA receives a packet from a local client destined
for the outside Internet, it replaces the source address in the IP packet header
with its own address and the source port in the TCP or UDP header with another
value chosen out of a local pool. It then recomputed the appropriate header
checksums and forwards the packet to the Internet as if it is originated from
P-660R-Tx using the IP address assigned by ISP. When reply packets from the
external Internet are received by P-660R-Tx, the original IP source address and
TCP/UDP source port numbers are written into
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P-660R-Tx Series Support Notes
the destination fields of the packet (since it is now moving in the opposite
direction), the checksums are recomputed, and the packet is delivered to its
true destination. This is because SUA keeps a table of the IP addresses and
port numbers of the local systems currently using it.
7. What is the difference between SUA and Full Feature NAT?
When you edit a remote node in Web Configurator, Advanced Setup,
Advanced Setup -> NAT -> Number of IPs, there will be two options for you:
Single
Multiple
Single here means SUA (Single User Account). In previous versions is a NAT
set with 2 rules: Many-to-One and Server. With SUA, 'visible' servers had to be
mapped to different ports, since the servers share only one global IP.
The P-660R-Tx now has Multiple, stands for Full Feature NAT, which supports
five types of IP/Port mapping: One to One, Many to One, Many to Many
Overload, Many to Many No Overload and Server. You can make special
application when you select Multiple. For example: With multiple global IP
addresses, multiple severs using the same port (e.g., FTP servers using port
21/20) are allowed on the LAN for outside access.
The P-660R-Tx supports NAT sets on a remote node basis. They are reusable,
but only one set is allowed for each remote node. The P-660R-Tx supports 8 sets
since there are 8 remote nodes.
8. Is it possible to access a server running behind SUA from the outside
Internet? How can I do it?
Yes, it is possible because P-660R-Tx delivers the packet to the local server by
looking up to a SUA server table. Therefore, to make a local server accessible to
the outside users, the port number and the inside IP address of the server must
be configured. (You can configure it in Web Configurator, Advanced Setup,
Advanced Setup -> NAT -> DMZ.
9. When do I need select Multiple IP in NAT (Full Feature NAT)?
Make multiple local servers on the LAN accessible from outside with
multiple global IP addresses
With Single IP (SUA), 'visible' servers had to be mapped to different ports, since
the servers share only one global IP. But when you select Multiple IPs
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P-660R-Tx Series Support Notes
(Full Feature), you can make multiple local servers (mapping the same port or not)
on the LAN accessible from outside with multiple global IP addresses.
Support Non-NAT Friendly Applications
Some servers providing Internet applications such as some MIRC servers do
not allow users to login using the same IP address. Thus, users on the same
network can not login to the same server simultaneously. In this case it is
better to use Many-to-Many No Overload or One-to-One NAT mapping types,
thus each user login to the server using a unique global IP address.
10. What IP/Port mapping does Multi-NAT support?
There is a Virtual Server column in Advanced Setup-> NAT. We can
configure a IP/Port mapping table there.
Multi-NAT supports five types of IP/port mapping: One to One, Many to One,
Many to Many Overload, Many to Many No Overload and Server. The details of
the mapping between ILA and IGA are described as below. Here we define the
local IP addresses as the Internal Local Addresses (ILA) and the global IP
addresses as the Inside Global Address (IGA),
One to One: In One-to-One mode, the P-660R-Tx maps one ILA to one
IGA.
Many to One: In Many-to-One mode, the P-660R-Tx maps multipleILA
to one IGA. This is equivalent to SUA (i.e., PAT, port address translation).
Many to Many Overload: In Many-to-Many Overload mode, the
P-660R-Tx maps the multiple ILA to shared IGA.
Many One-to-One: In Many One-to-One mode, the P-660R-Tx
maps each ILA to unique IGA.
Server: In Server mode, the P-660R-Tx maps multiple inside servers to
one global IP address. This allows us to specify multiple servers of different
types behind the NAT for outside access. Note that if you want to map
each server to one unique IGA please use the One-to-One mode.
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P-660R-Tx Series Support Notes
The following table summarizes the five types.
NAT Type
IP Mapping
One-to-One
ILA1<--->IGA1
Many-to-One
(SUA/PAT)
ILA1<--->IGA1
ILA2<--->IGA1
...
Many-to-Many
Overload
ILA1<--->IGA1
ILA2<--->IGA2
ILA3<--->IGA1
ILA4<--->IGA2
...
Many
One-to-One
ILA1<--->IGA1
ILA2<--->IGA2
ILA3<--->IGA3
ILA4<--->IGA4
...
Server
Server 1 IP<--->IGA1
Server 2 IP<--->IGA1
11. How many network users can the SUA/NAT support?
The P-660R-Tx does not limit the number of the users but the number of the
NAT sessions. The P-660R-Tx supports 1024 sessions.
12. How can I protect against IP spoofing attacks?
The P-660R-Tx's filter sets provide a means to protect against IP spoofing
attacks. The basic scheme is according to your need to set different filter type.
There are three types of filter: IP/MAC Filter, Application Filter, and URL Filter.
You can use IP/MAC filter to decide the input data or output one to be filtered or
you may simply set filter conditions depend on your application or URL.
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P-660R-Tx Series Support Notes
Product FAQ
1. How can I manage P-660R-Tx?
English Web GUI for Local and Remote management
CLI (Command-line interface)
Telnet support (Administrator Password Protected ) for remote
configuration change and status monitoring
FTP sever, firmware upgrade and configuration backup and restore are
supported(Administrator Password Protected)
2. What is the default password for Web Configurator?
By factory default the password for P-660R-Tx Web Configurator is 1234.
You can login in as an administrator. 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. How do I know the P-660R-Tx's WAN IP address assigned by the ISP?
You can view " IP Address<from ISP>: x.x.x.x" shown in Web Configurator
Status->Device Info ->WAN ‟ to check this IP address.
4. What is Traffic Shaping？
Traffic Shaping allocates the bandwidth to WAN dynamically and aims at
boosting the efficiency of the bandwidth. If there are several VCs in the
P-660R-Tx but only one VC activated at one time, the P-660R-Tx allocates
all the Bandwidth to the VC and the VC gets full bandwidth. If another VCs
are activated later, the bandwidth is yield to other VCs after ward.
5. Why do we perform traffic shaping in the P-660R-Tx?
The P-660R-Tx must manage traffic fairly and provide bandwidth allocation for
different sorts of applications, such as voice, video, and data. All applications
have their own natural bit rate. Large data transactions have a fluctuating natural
bit rate. The P-660R-Tx is able to support variable traffic among different virtual
connections. Certain traffic may be discarded if the virtual connection
experiences congestion. Traffic shaping defines a set of actions taken by the
P-660R-Tx to avoid congestion; traffic shaping takes measures to adapt to
unpredictable fluctuations in traffic flows and other problems among virtual
connections.
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P-660R-Tx Series Support Notes
6. What do the parameters (PCR, SCR, and MBS) mean?
Traffic shaping parameters (PCR, SCR, MBS) can be set in Web Configurator,
Interface Setup, Interface Setup -> Internet -> QoS:
Peak Cell Rate (PCR): The maximum bandwidth allocated to this connection.
The VC connection throughput is limited by PCR.
Sustainable Cell Rate (SCR): The least guaranteed bandwidth of a VC.
When there are multi-VCs on the same line, the VC throughput is guaranteed by
SCR.
Maximum Burst Size(MBS): The amount of cells transmitted through this VC
at the Peak Cell Rate before yielding to other VCs. Total bandwidth of the line is
dedicated to single VC if there is only one VC on the line. However, as the other
VC asking the bandwidth, the MBS defines the maximum number of cells
transmitted via this VC with Peak Cell rate before yielding to other VCs.
The P-660R-Tx holds the parameters for shaping the traffic among its virtual
channels. If you do not need traffic shaping, please set SCR = 0, MBS =
0 and PCR as the maximum value according to the line rate (for example, 2.3
Mbps line rate will result PCR as 5424 cell/sec.)
7. What do the ATM QoS Types (CBR, UBR, VBR, rtVBR, nrtVBR) mean?
Constant bit rate (CBR): An ATM bandwidth-allocation service that requires
the user to determine a fixed bandwidth requirement at the time the connection
is set up so that the data can be sent in a steady stream. CBR service is often
used when transmitting fixed-rate uncompressed video.
Unspecified bit rate (UBR): An ATM bandwidth-allocation service that
does not guarantee any throughput levels and uses only available
bandwidth. UBR is often used when transmitting data that can tolerate
delays, such as e-mail.
Variable bit rate (VBR): An ATM bandwidth-allocation service that allows users to
specify a throughput capacity (i.e., a peak rate) and a sustained rate but data is
not sent evenly. You can select VBR for burst traffic and bandwidth sharing with
other applications. It contains two subclasses:
Non-real time variable bit rate (nrtVBR) and Real time variable bit rate
(rtVBR).
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P-660R-Tx Series Support Notes
8. The P-660R-Tx supports Bridge and Router mode, what's the difference
between them?
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.
9. 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-660R-Tx if the ISP uses PPPoE.
10. 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.
11. When do I need to choose dynamic IP?
If your ISP provides you an IP address automatically, typically used for Cable
service. In this case your computer gets an IP dynamically assigned by DHCP.
To use this mode, you need to do some corresponding configurations on the
web page: Interface Setup -> Internet -> Encapsulation:
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P-660R-Tx Series Support Notes
Key setting:
Field
Description
Encapsulation
Choose one of encapsulation mode used in Dynamic IP condition .There
are four modes: 1483 Bridged IP LLC, 1483 Bridge IP VC-Mux, 1483
Route IP LLC(IPoA),and 1483 Route IP VC-Mux.
Bridge
Interface
When activated, not only Router connects but bridge connects. Meanwhile,
Router and Bridge use the same PVC, Lan PC could get an wan IP which is
assigned by PPPOE server. So we needn ‟ t two PVCs to do multicast.
NAT
Choose to enable or disable NAT function.
Default Route
Choose “yes”to set the current PVC as a default gateway to internet from
your device. Note that there must be only one default gateway. If you
have configured more than one PVC as default gateway, the last one
would be efficient.
TCP MTU
Option
Set TCP MTU value. “0”is considered as default value.
Dynamic
Route
Draw out the list to choose an RIP vision. And you can choose the RIP
direction. Choose none direction to disable RIP function.
Multicast
Choose to enable or disable multicast function
MAC
Spoofing
Choose to enable Mac spoofing function. You can set a wanted MAC
below
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P-660R-Tx Series Support Notes
12. 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-660R-Tx to
reach our internal server. It is inconvenient for the users if this IP is dynamic.
With DDNS supported by the P-660R-Tx, you apply a DNS name (e.g.,
www.zyxel.com.tw) for your server (e.g., Web server) from a DDNS server. The
outside users can always access the web server using the www.zyxel.com.tw
regardless of the WAN IP of the P-660R-Tx.
When the ISP assigns the P-660R-Tx a new IP, the P-660R-Tx updates this IP
to DDNS server so that the server can update its IP -to-DNS entry. Once the
IP-to-DNS table in the DDNS server is updated, the DNS name for your web
server (i.e., www.zyxel.com.tw) is still usable.
13. When do I need DDNS service?
When you want your internal server to be accessed by using DNS name rather
than using the dynamic IP address we can use the DDNS service. The DDNS
server allows to alias a dynamic IP address to a static hostname. Whenever the
ISP assigns you a new IP, the P-660R-Tx sends this IP to the DDNS server for
its updates.
14. What is DDNS wildcard? Does the P-660R-Tx support DDNS wildcard?
Some DDNS servers support the wildcard feature which allows the hostname,
*.yourhost.dyndns.org, to be aliased to the same IP address as
yourhost.dyndns.org. This feature is useful when there are multiple servers inside
and you want users to be able to use things such as www.yourhost.dyndns.org
and still reach your hostname.
Yes, the P-660R-Tx supports DDNS wildcard that http://www.dyndns.org/
supports. And you can choose to active or inactive this feature on the web
configuration page. When using wildcard, you simply enter
yourhost.dyndns.org on the web configuration page.
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P-660R-Tx Series Support Notes
15. Can the P-660R-Tx's SUA (Simple IP) handle IPSec packets sent by the
IPSec gateway?
Yes, the P-660R-Tx's SUA can handle IPSec ESP Tunneling mode. We know
when packets go through SUA; SUA will change the source IP address and
source port for the host. To pass IPSec packets, SUA must understand the ESP
packet with protocol number 50; replace the source IP address of the IPSec
gateway to the router's WAN IP address. However, SUA should not change the
source port of the UDP packets which are used for key managements. Because
the remote gateway checks this source port during connections, the port thus is
not allowed to be changed.
16. How do I setup P-660R-Tx for routing IPSec packets over SUA?
For outgoing IPSec tunnels, no extra setting is required.
For forwarding the inbound IPSec ESP tunnel, A 'Default' server set is required.
You could configure it in Web Configurator, Advanced Setup, Advanced Setup
-> NAT -> DMZ:
Note: First we should set Number of IPs as Single for SUA use.
It is because SUA makes your LAN appear as a single machine to the outside
world. LAN users are invisible to outside users. So, to make an internal server
for outside access, we must specify the service port and the LAN IP of this
server in Web configuration page. Thus SUA is able to forward the incoming
packets to the requested service behind SUA and the outside users access
the server using the P-660R-Tx's WAN IP address. So, we have to configure
the internal IPSec client as a default server (unspecified service port) when it
acts a server gateway.
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P-660R-Tx Series Support Notes
17. What is IP Policy Routing (IPPR)?
Traditionally, routing is based on the destination address only and the router
takes the shortest path to forward a packet. IP Policy Routing (IPPR) provides a
mechanism to override the default routing behavior and alter the packet
forwarding based on the policy defined by the network administrator.
Policy-based routing is applied to incoming packets on a per interface basis, prior
to the normal routing. Network Administrators can use IPPR to distribute traffic
among multiple paths. For example, if a network has both the Internet and remote
node connections, we can route the Web packets to the Internet using one policy
and route the FTP packets to the remote LAN using another policy. See the figure
below.
P-660R-Tx
Use IPPR to distribute traffic among multiple paths
Benefits
Source-Based Routing - Network Administrators can use policy-based
routing to direct traffic from different users through different connections.
Quality of Service (QoS)- Organizations can differentiate traffic by setting the
precedence or TOS (Type of Service) values in the IP header at the periphery of
the network to enable the backbone to prioritize traffic.
Cost Savings- IPPR allows organizations to distribute interactive traffic on
high-bandwidth, high-cost path while using low-path for batch traffic.
Load Sharing- Network Administrators can use IPPR to distribute traffic
among multiple paths.
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P-660R-Tx Series Support Notes
18. How does the IPPR work?
A policy defines the matching criteria and the action to take when a packet
meets the criteria. The action is taken only when all the criteria are met. The
criteria include the source address and port, IP protocol (ICMP, UDP, TCP, etc),
destination address and port, TOS and precedence (fields in the IP header) and
length. The inclusion of length criterion is to differentiate between interactive
and bulk traffic. Interactive applications, e.g., Telnet, tend to have short packets,
while bulk traffic, e.g., file transfer, tends to have large packets.
The actions that can be taken include routing the packet to a different gateway
(and hence the outgoing interface) and the TOS and precedence fields in the IP
header. IPPR follows the existing packet filtering facility of ZyNOS in style and in
implementation. The policies are divided into sets, where related policies are
grouped together. A use defines the policies before applying them to an interface
or a remote node, in the same fashion as the filters. There are 12 policy sets with
6 policies in each set.
19. What is CWMP?
P-660R-Tx supports TR-069 Amendment 1 (CPE WAN Management Protocol
Release 2.0) and TR-069 Amendment 2 (CPE WAN Management Protocol
v1.1, Release 3.0).
TR-069 is a protocol that defines how your ZyXEL Device (ZD) can be managed
via a management server (MS) such as ZyXEL ‟ s Vantage Access.
An administrator can use a management server to remotely set up the ZyXEL
device, modify settings, perform firmware upgrades as well as monitor and
diagnose the ZyXEL device. All you have to do is enable the device to be
managed by a management server and specify the management server IP
address or domain name and username and password.
20. How to configure CWMP on P-660R-Tx?
You can set CWMP on the Web configuration page: Access Management ->
CWMP -> CWMP Setup:
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P-660R-Tx Series Support Notes
Key Settings
Field
Description
Login ACS
Configure this part of the screen to log into the management server.
CWMP
Select Activated to allow the ZyXEL Device to be managed by a management
server or select Deactivated to not allow the ZyXEL Device to
be managed by a management server.
URL
Type in the IP address or domain name of the management server.
User Name
Type a user name of up to xxx printable characters found on an
English-language keyboard.
Password
Type a password of up to xxx printable characters found on an
English-language keyboard. Spaces are not allowed.
Connection
Request
Use this part of the screen to allow the management server to connect to the
ZyXEL Device after a successful login.
Path
This is the part for verification from ACS to ZyXEL Device. It can be
considered as CPE ‟ s URL. When ACS initialize a session, it will connect
with CPE basing on this part.
Port
The default port for access to the ZyXEL Device from the management server
is the HTTP port, port 80. If you change it, make sure it does not conflict with
another port on your network and it is recommended to use a port number
above 1024 (not a commonly used port). The management server should use
this port to connect to the ZyXEL Device. You may need
to alter your firewall or NAT port forwarding rules if they were already
configured.
Periodic
Inform
Select Activated to have the ZyXEL Device periodically send information to
the management server (recommended if CWMP is enabled) or select
Deactivated to not have the ZyXEL Device periodically send information to
the management server
Interval
Enter a value between 1 and 86400 seconds.
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All contents copyright © 2010 ZyXEL Communications Corporation.

P-660R-Tx Series Support Notes
Note: 1. There are two groups
‟ user name and password. The first one you meet on the
web configuration page is used to authenticate the ZyXEL Device when making a
connection to the management server. This user name and password on the management
server and the ZyXEL Device must be the same. The second group is used to authenticate
the management server when making a connection.
2. The interval is the duration in seconds for which the ZyXEL Device MUST
attempt to connect with the management server to send information and check for
configuration updates.
21. How to configure ACL?
You can find the configuration page on web configuration page: Access
Management -> ACL
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All contents copyright © 2010 ZyXEL Communications Corporation.

P-660R-Tx Series Support Notes
Key Settings:
Field
Description
ACL
Select Activated to enable access control on the ZyXEL Device or select
Deactivated to disable it.
ACL Rule
Index
Select an index rule number in order to edit or delete it.
Active
Select Yes to enable this active control rule or No to disable it.
Secure IP
Address
Enter the range of IP addresses of computers that are allowed to access the device.
0.0.0.0 ~ 0.0.0.0 means that any computer can access the ZyXEL Device. If you
want just one computer to be able to access the ZyXEL Device, then enter its IP
Address in both fields.
Application
Select the service through which the computer can access the device.
•If you want to allow a user to connect to the ZyXEL Device using the web configuration
page, select Web .
•If you want to allow a user to connect to the ZyXEL Device using Telnet, select
Telnet .
•If you want to allow a user to upload firmware to the ZyXEL Device, select FTP .
•If you want to allow an administrator to send SNMP commands, select SNMP .
•If you want to allow a user to find the ZyXEL Device on the network (for
troubleshooting purposes, for example), select Ping .
•You can allow access for all services, select ALL . You cannot select a combination of
services.
Interface
Select the port through which you can access the device. Select Both for access via
either port. If you configure 0.0.0.0 ~ 0.0.0.0 Secure IP Address , ALL services and
WAN interface, you will not be able to access the device at all from the LAN .
Access
Control
Listing
The summary table displays the configured parameters for the selected rule.
SAVE
Click SAVE to apply your settings back to the ZyXEL Device.
DELETE
Select an access control rule index number and click DELETE to remove it.
CANCEL
Click CANCEL to reset the values to the previously-configured ones.
22. What is UPnP?
Universal Plug and Play (UPnP) is a set of computer network protocols
promulgated by the UPnP Forum. The goals of UPnP are to allow devices to
connect seamlessly and to simplify the implementation of networks in the home
(data sharing, communications, and entertainment) and corporate environments.
UPnP achieves this by defining and publishing UPnP device control protocols
built upon open, Internet-based communication standards.
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All contents copyright © 2010 ZyXEL Communications Corporation.

P-660R-Tx Series Support Notes
ADSL FAQ
1. How does ADSL compare to Cable modems?
ADSL provides a dedicated service over a single telephone line; cable modems
offer a dedicated service over a shared media. While cable modems have
greater downstream bandwidth capabilities (up to 30 Mbps), that bandwidth is
shared among all users on a line, and will therefore vary, perhaps dramatically,
as more users in a neighborhood get online at the same time. Cable modem
upstream traffic will in many cases be slower than ADSL, either because the
particular cable modem is inherently slower, or because of rate reductions
caused by contention for upstream bandwidth slots. The big difference between
ADSL and cable modems, however, is the number of lines available to each.
There are no more than 12 million homes passed today that can support
two-way cable modem transmissions, and while the figure also grows steadily, it
will not catch up with telephone lines for many years. Additionally, many of the
older cable networks are not capable of offering a return channel; consequently,
such networks will need significant upgrading before they can offer high
bandwidth services.
2. 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.
3. How do I know the ADSL line is up?
You can see the DSL LED Green on the P-660R-Tx's front panel is on when the
ADSL physical layer is up.
4. Does the VC-based multiplexing perform better than the LLC-based
multiplexing?
Though the LLC-based multiplexing can carry multiple protocols over a single VC,
it requires extra header information to identify the protocol being carried on the
virtual circuit (VC). The VC-based multiplexing needs a separate VC for carrying
each protocol but it does not need the extra headers. Therefore, the VC-based
multiplexing is more efficient.
We can choose one of them on the web configuration page: Interface Setup ->
Internet ->Dynamic IP ->Encapsulation:
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All contents copyright © 2010 ZyXEL Communications Corporation.