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access control and billing functionality in a manner similar to dial-up services using PPP. The
BIPAC-5100/5100W 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.
3.2.4 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.
3.3 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.
3.3.1 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.
3.3.2 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.
3.4 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.
3.5 Wizard Setup Configuration: First Screen
In the SITE MAP screen click Wizard Setup to display the first wizard screen.
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The following table describes the labels in this screen.
LABEL
DESCRIPTION
Mode
From the
Mode
drop-down list box, select
Routing
(default) if your ISP allows
multiple computers to share an Internet account. Otherwise select
Bridge
.
Encapsulation
Select the encapsulation type your ISP uses from the
Encapsulation
drop-down
list box. Choices vary depending on what you select in the
Mode
field.
If you select
Bridge
in the
Mode
field, select either
PPPoA
or
RFC 1483
.
If you select
Routing
in the
Mode
field, select
PPPoA
,
RFC 1483
,
ENET ENCAP
or
PPPoE
.
Multiplex
Select the multiplexing method used by your ISP from the
Multiplex
drop-down
list box either VC-based or LLC-based.
Virtual Circuit ID
VPI (Virtual Path Identifier) and VCI (Virtual Channel Identifier) define a virtual
circuit. Refer to
VPI
Enter the VPI assigned to you. This field may already be configured.
VCI
Enter the VCI assigned to you. This field may already be configured.
Next
Click this button to go to the next wizard screen. The next wizard screen you see
depends on what protocol you chose above. Click on the protocol link to see the
next wizard screen for that protocol.
3.6 IP Address and Subnet Mask
Similar to the way houses on a street share a common street name, so too do computers on a
LAN share one common network number.
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Where you obtain your network number depends on your particular situation. If the ISP or your
network administrator assigns you a block of registered IP addresses, follow their instructions
in selecting the IP addresses and the subnet mask.
If the ISP did not explicitly give you an IP network number, then most likely you have a single
user account and the ISP will assign you a dynamic IP address when the connection is
established. If this is the case, it is recommended that you select a network number from
192.168.0.0 to 192.168.255.0 and you must enable the Network Address Translation (NAT)
feature of the BIPAC-5100/5100W. The Internet Assigned Number Authority (IANA) reserved
this block of addresses specifically for private use; please do not use any other number unless
you are told otherwise. Let's say you select 192.168.1.0 as the network number; which covers
254 individual addresses, from 192.168.1.1 to 192.168.1.254 (zero and 255 are reserved). In
other words, the first three numbers specify the network number while the last number
identifies an individual computer on that network.
Once you have decided on the network number, pick an IP address that is easy to remember,
for instance, 192.168.1.254, for your BIPAC-5100/5100W, but make sure that no other device
on your network is using
that IP address.
The subnet mask specifies the network number portion of an IP address. Your
BIPAC-5100/5100W will compute the subnet mask automatically based on the IP address that
you entered. You don't need to change the subnet mask computed by the BIPAC-5100/5100W
unless you are instructed to do otherwise.
3.7 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.
3.7.1 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.
3.7.2 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.
3.7.3 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 BIPAC-5100/5100W acts as a DHCP client on the WAN port and so the IP Address and
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ENET ENCAP Gateway fields are not applicable (N/A) as the DHCP server assigns them to
the BIPAC-5100/5100W.
3.7.4 Private IP Addresses
Every machine on the Internet must have a unique address. If your networks are isolated from
the Internet, for example, only between your two branch offices, you can assign any IP
addresses to the hosts without problems. However, the Internet Assigned Numbers Authority
(IANA) has reserved the following three blocks of IP addresses specifically for private
networks:
10.0.0.0 - 10.255.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 - 192.168.255.255
You can obtain your IP address from the IANA, from an ISP or it can be assigned from a
private network. If you belong to a small organization and your Internet access is through an
ISP, the ISP can provide you with the Internet addresses for your local networks. On the other
hand, if you are part of a much larger organization, you should consult your network
administrator for the appropriate IP addresses.
3.8 Nailed-Up Connection (PPP)
A nailed-up connection is a dial-up line where the connection is always up regardless of traffic
demand. The BIPAC-5100/5100W does two things when you specify a nailed-up connection.
The first is that idle timeout is disabled. The second is that the BIPAC-5100/5100W 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.
Do not specify a nailed-up connection unless your telephone company offers flat-rate service
or you need a constant connection and the cost is of no concern
3.9 NAT
NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP address of a
host in a packet, for example, the source address of an outgoing packet, used within one
network to a different IP address known within another network.
3.10 Wizard Setup Configuration: Second Screen
The second wizard screen varies depending on what mode and encapsulation type you use.
All screens shown are with routing mode. Configure the fields and click Next to continue.
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3.10.1 PPPoE
Select PPPoE from the Encapsulation drop-down list box in the first wizard screen to display
the screen as shown.
The following table describes the labels in this screen.
LABEL
DESCRIPTION
Service Name
Type the name of your PPPoE service here.
User Name
Configure
User Name
and
Password
fields for
PPPoA
and
PPPoE
encapsulation
only. Enter the user name exactly as your ISP assigned. If assigned a name in the
form
user@domain
where domain identifies a service name, then enter both
components exactly as given.
Password
Enter the password associated with the user name above.
IP Address
A static IP address is a fixed IP that your ISP gives you. A dynamic IP address is not
fixed; the ISP assigns you a different one each time you connect to the Internet. The
Single User
Account feature can be used with either a dynamic or static IP address.
Select
Obtain an IP Address Automatically
if you have a dynamic IP address;
otherwise select
Static IP Address
and type your ISP assigned IP address in the
IP
Address
text box below.
Connection
Select
Connect on Demand
when you don't want the connection up all the time and
specify an idle time-out (in seconds) in the
Max. Idle Timeout
field. The default
setting selects
Connection on Demand
with 0 as the idle time-out, which means
the Internet session will Select
Nailed-Up Connection
when you want your
connection up all the time. The BIPAC-5100/5100W will try to bring up the
connection automatically if it is disconnected.

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