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Page 41 / 268 Scroll up to view Page 36 - 40
Chapter 3 Wizard Setup for Internet Access
P-660R-F1 Series User’s Guide
41
•
If the user name and/or password you entered for PPPoE or PPPoA connection are not correct,
the screen displays as shown next. Click
Back to Username and Password setup
to go back
to the screen where you can modify them.
Figure 20
Connection Test Failed-1
•
If the following screen displays, check if your account is activated or click
Restart the Internet
Setup Wizard
to verify your Internet access settings.
Figure 21
Connection Test Failed-2.
Apply
Click
Apply
to save your changes back to the ZyXEL Device.
Exit
Click
Exit
to close the wizard screen without saving your changes.
Table 11
Internet Connection with PPPoA (continued)
LABEL
DESCRIPTION
Page 42 / 268
Chapter 3 Wizard Setup for Internet Access
P-660R-F1 Series User’s Guide
42
When you are finished with the Internet Setup Wizard the following screen displays your
configuration details. Click
Finish
to exit the wizard.
Figure 22
Internet Setup Wizard Finished
Page 43 / 268
P-660R-F1 Series User’s Guide
43
C
HAPTER
4
WAN Setup
This chapter describes how to configure WAN settings.
4.1
WAN Overview
A WAN (Wide Area Network) is an outside connection to another network or the Internet.
4.1.1
Encapsulation
Be sure to use the encapsulation method required by your ISP. The ZyXEL Device supports the
following methods.
4.1.1.1
ENET ENCAP
The MAC Encapsulated Routing Link Protocol (ENET ENCAP) is only implemented with the IP
network protocol. IP packets are routed between the Ethernet interface and the WAN interface and
then formatted so that they can be understood in a bridged environment. For instance, it
encapsulates routed Ethernet frames into bridged ATM cells. ENET ENCAP requires that you specify
a gateway IP address in the
ENET ENCAP Gateway
field in the second wizard screen. You can get
this information from your ISP.
4.1.1.2
PPP over Ethernet
PPPoE (Point-to-Point Protocol over Ethernet) provides access control and billing functionality in a
manner similar to dial-up services using PPP. PPPoE is an IETF standard (RFC 2516) specifying how
a personal computer (PC) interacts with a broadband modem (DSL, cable, wireless, etc.)
connection.
For the service provider, PPPoE offers an access and authentication method that works with existing
access control systems (for example RADIUS).
One of the benefits of PPPoE is the ability to let you access one of multiple network services, a
function known as dynamic service selection. This enables the service provider to easily create and
offer new IP services for individuals.
Operationally, PPPoE saves significant effort for both you and the ISP or carrier, as it requires no
specific configuration of the broadband modem at the customer site.
By implementing PPPoE directly on the ZyXEL Device (rather than individual computers), the
computers on the LAN do not need PPPoE software installed, since the ZyXEL Device does that part
of the task. Furthermore, with NAT, all of the LANs’ computers will have access.
Page 44 / 268
Chapter 4 WAN Setup
P-660R-F1 Series User’s Guide
44
4.1.1.3
PPPoA
PPPoA stands for Point to Point Protocol over ATM Adaptation Layer 5 (AAL5). A PPPoA connection
functions like a dial-up Internet connection. The ZyXEL Device encapsulates the PPP session based
on RFC1483 and sends it through an ATM PVC (Permanent Virtual Circuit) to the Internet Service
Provider’s (ISP) DSLAM (digital access multiplexer). Please refer to RFC 2364 for more information
on PPPoA. Refer to RFC 1661 for more information on PPP.
4.1.1.4
RFC 1483
RFC 1483 describes two methods for Multiprotocol Encapsulation over ATM Adaptation Layer 5
(AAL5). The first method allows multiplexing of multiple protocols over a single ATM virtual circuit
(LLC-based multiplexing) and the second method assumes that each protocol is carried over a
separate ATM virtual circuit (VC-based multiplexing). Please refer to the RFC for more detailed
information.
4.1.2
Multiplexing
There are two conventions to identify what protocols the virtual circuit (VC) is carrying. Be sure to
use the multiplexing method required by your ISP.
4.1.2.1
VC-based Multiplexing
In this case, by prior mutual agreement, each protocol is assigned to a specific virtual circuit; for
example, VC1 carries IP, etc. VC-based multiplexing may be dominant in environments where
dynamic creation of large numbers of ATM VCs is fast and economical.
4.1.2.2
LLC-based Multiplexing
In this case one VC carries multiple protocols with protocol identifying information being contained
in each packet header. Despite the extra bandwidth and processing overhead, this method may be
advantageous if it is not practical to have a separate VC for each carried protocol, for example, if
charging heavily depends on the number of simultaneous VCs.
4.1.3
Encapsulation and Multiplexing Scenarios
For Internet access you should use the encapsulation and multiplexing methods used by your ISP.
Consult your telephone company for information on encapsulation and multiplexing methods for
LAN-to-LAN applications, for example between a branch office and corporate headquarters. There
must be prior agreement on encapsulation and multiplexing methods because they cannot be
automatically determined. What method(s) you use also depends on how many VCs you have and
how many different network protocols you need. The extra overhead that ENET ENCAP
encapsulation entails makes it a poor choice in a LAN-to-LAN application. Here are some examples
of more suitable combinations in such an application.
4.1.3.1
Scenario 1: One VC, Multiple Protocols
PPPoA
(RFC-2364) encapsulation with
VC-based
multiplexing is the best combination because no
extra protocol identifying headers are needed. The
PPP
protocol already contains this information.
Page 45 / 268
Chapter 4 WAN Setup
P-660R-F1 Series User’s Guide
45
4.1.3.2
Scenario 2: One VC, One Protocol (IP)
Selecting
RFC-1483
encapsulation with
VC-based
multiplexing requires the least amount of
overhead (0 octets). However, if there is a potential need for multiple protocol support in the future,
it may be safer to select
PPPoA
encapsulation instead of
RFC-1483
, so you do not need to
reconfigure either computer later.
4.1.3.3
Scenario 3: Multiple VCs
If you have an equal number (or more) of VCs than the number of protocols, then select
RFC-1483
encapsulation and
VC-based
multiplexing.
4.1.4
VPI and VCI
Be sure to use the correct Virtual Path Identifier (VPI) and Virtual Channel Identifier (VCI) numbers
assigned to you. The valid range for the VPI is 0 to 255 and for the VCI is 32 to 65535 (0 to 31 is
reserved for local management of ATM traffic). Please see the appendix for more information.
4.1.5
IP Address Assignment
A static IP is a fixed IP that your ISP gives you. A dynamic IP is not fixed; the ISP assigns you a
different one each time. The Single User Account feature can be enabled or disabled if you have
either a dynamic or static IP. However the encapsulation method assigned influences your choices
for IP address and ENET ENCAP gateway.
4.1.5.1
IP Assignment with PPPoA or PPPoE Encapsulation
If you have a dynamic IP, then the
IP Address
and
ENET ENCAP Gateway
fields are not
applicable (N/A). If you have a static IP, then you
only
need to fill in the
IP Address
field and
not
the
ENET ENCAP Gateway
field.
4.1.5.2
IP Assignment with RFC 1483 Encapsulation
In this case the IP Address Assignment
must
be static with the same requirements for the
IP
Address
and
ENET ENCAP Gateway
fields as stated above.
4.1.5.3
IP Assignment with ENET ENCAP Encapsulation
In this case you can have either a static or dynamic IP. For a static IP you must fill in all the
IP
Address
and
ENET ENCAP Gateway
fields as supplied by your ISP. However for a dynamic IP, the
ZyXEL Device acts as a DHCP client on the WAN port and so the
IP Address
and
ENET ENCAP
Gateway
fields are not applicable (N/A) as the DHCP server assigns them to the ZyXEL Device.
4.1.6
Nailed-Up Connection (PPP)
A nailed-up connection is a dial-up line where the connection is always up regardless of traffic
demand. The ZyXEL Device does two things when you specify a nailed-up connection. The first is
that idle timeout is disabled. The second is that the ZyXEL Device will try to bring up the connection
when turned on and whenever the connection is down. A nailed-up connection can be very
expensive for obvious reasons.

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