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Page 61 / 327 Scroll up to view Page 56 - 60
VMG3926-B10A User’s Guide
61
C
HAPTER
6
Broadband
6.1
Overview
This chapter discusses the VMG’s
Broadband
screens. Use these screens to configure your VMG for
Internet access.
A WAN (Wide Area Network) connection is an outside connection to another network or the
Internet. It connects your private networks, such as a LAN (Local Area Network) and other
networks, so that a computer in one location can communicate with computers in other locations.
Figure 17
LAN and WAN
6.1.1
What You Can Do in this Chapter
•
Use the
Broadband
screen to view, remove or add a WAN interface. You can also configure the
WAN settings on the VMG for Internet access (
Section 6.2 on page 65
).
•
Use the
3G Backup
screen to configure 3G WAN connection (
Section 6.3 on page 74
).
•
Use the
Advanced
screen to enable or disable PTM over ADSL, Annex M/Annex J, and DSL PhyR
functions (
Section 6.4 on page 78
).
•
Use the
802.1x
screen to view and configure the IEEE 802.1X settings on the VMG (
Section 6.5
on page 80
).
WAN
Table 6
WAN Setup Overview
LAYER-2 INTERFACE
INTERNET CONNECTION
CONNECTION
DSL LINK
TYPE
MODE
ENCAPSULATION
CONNECTION SETTINGS
ADSL/VDSL
over PTM
N/A
Routing
PPPoE
PPP information, IPv4/IPv6 IP
address, routing feature, DNS
server, VLAN, QoS, and MTU
IPoE
IPv4/IPv6 IP address, routing
feature, DNS server, VLAN, QoS,
and MTU
Bridge
N/A
VLAN and QoS
Page 62 / 327
Chapter 6 Broadband
VMG3926-B10A User’s Guide
62
6.1.2
What You Need to Know
The following terms and concepts may help as you read this chapter.
WAN IP Address
The WAN IP address is an IP address for the VMG, which makes it accessible from an outside
network. It is used by the VMG to communicate with other devices in other networks. It can be
static (fixed) or dynamically assigned by the ISP each time the VMG tries to access the Internet.
If your ISP assigns you a static WAN IP address, they should also assign you the subnet mask and
DNS server IP address(es).
ATM
Asynchronous Transfer Mode (ATM) is a WAN networking technology that provides high-speed data
transfer. ATM uses fixed-size packets of information called cells. With ATM, a high QoS (Quality of
Service) can be guaranteed. ATM uses a connection-oriented model and establishes a virtual circuit
(VC) between Finding Out More
PTM
Packet Transfer Mode (PTM) is packet-oriented and supported by the VDSL2 standard. In PTM,
packets are encapsulated directly in the High-level Data Link Control (HDLC) frames. It is designed
to provide a low-overhead, transparent way of transporting packets over DSL links, as an
alternative to ATM.
ADSL over ATM
EoA
Routing
PPPoE/PPPoA
ATM PVC configuration, PPP
information, IPv4/IPv6 IP address,
routing feature, DNS server, VLAN,
QoS, and MTU
IPoE/IPoA
ATM PVC configuration, IPv4/IPv6
IP address, routing feature, DNS
server, VLAN, QoS, and MTU
Bridge
N/A
ATM PVC configuration, and QoS
Ethernet
N/A
Routing
PPPoE
PPP user name and password, WAN
IPv4/IPv6 IP address, routing
feature, DNS server, VLAN, QoS,
and MTU
IPoE
WAN IPv4/IPv6 IP address, NAT,
DNS server and routing feature
Bridge
N/A
VLAN and QoS
Table 6
WAN Setup Overview
LAYER-2 INTERFACE
INTERNET CONNECTION
CONNECTION
DSL LINK
TYPE
MODE
ENCAPSULATION
CONNECTION SETTINGS
Page 63 / 327
Chapter 6 Broadband
VMG3926-B10A User’s Guide
63
IPv6 Introduction
IPv6 (Internet Protocol version 6), is designed to enhance IP address size and features. The
increase in IPv6 address size to 128 bits (from the 32-bit IPv4 address) allows up to 3.4 x 10
38
IP
addresses. The VMG can use IPv4/IPv6 dual stack to connect to IPv4 and IPv6 networks, and
supports IPv6 rapid deployment (6RD).
IPv6 Addressing
The 128-bit IPv6 address is written as eight 16-bit hexadecimal blocks separated by colons (:). This
is an example IPv6 address
2001:0db8:1a2b:0015:0000:0000:1a2f:0000
.
IPv6 addresses can be abbreviated in two ways:
•
Leading zeros in a block can be omitted. So
2001:0db8:1a2b:0015:0000:0000:1a2f:0000
can be written as
2001:db8:1a2b:15:0:0:1a2f:0
.
•
Any number of consecutive blocks of zeros can be replaced by a double colon. A double
colon can only appear once in an IPv6 address. So
2001:0db8:0000:0000:1a2f:0000:0000:0015
can be written as
2001:0db8::1a2f:0000:0000:0015
,
2001:0db8:0000:0000:1a2f::0015
,
2001:db8::1a2f:0:0:15
or
2001:db8:0:0:1a2f::15
.
IPv6 Prefix and Prefix Length
Similar to an IPv4 subnet mask, IPv6 uses an address prefix to represent the network address. An
IPv6 prefix length specifies how many most significant bits (start from the left) in the address
compose the network address. The prefix length is written as “/x” where x is a number. For
example,
2001:db8:1a2b:15::1a2f:0/32
means that the first 32 bits (
2001:db8
) is the subnet prefix.
IPv6 Subnet Masking
Both an IPv6 address and IPv6 subnet mask compose of 128-bit binary digits, which are divided
into eight 16-bit blocks and written in hexadecimal notation. Hexadecimal uses four bits for each
character (1 ~ 10, A ~ F). Each block’s 16 bits are then represented by four hexadecimal
characters. For example, FFFF:FFFF:FFFF:FFFF:FC00:0000:0000:0000.
IPv6 Rapid Deployment
Use IPv6 Rapid Deployment (6rd) when the local network uses IPv6 and the ISP has an IPv4
network. When the VMG has an IPv4 WAN address and you set
IPv6/IPv4 Mode
to
IPv4 Only
,
you can enable 6rd to encapsulate IPv6 packets in IPv4 packets to cross the ISP’s IPv4 network.
The VMG generates a global IPv6 prefix from its IPv4 WAN address and tunnels IPv6 traffic to the
ISP’s Border Relay router (BR in the figure) to connect to the native IPv6 Internet. The local
network can also use IPv4 services. The VMG uses it’s configured IPv4 WAN IP to route IPv4 traffic
to the IPv4 Internet.
Page 64 / 327
Chapter 6 Broadband
VMG3926-B10A User’s Guide
64
Figure 18
IPv6 Rapid Deployment
Dual Stack Lite
Use Dual Stack Lite when local network computers use IPv4 and the ISP has an IPv6 network.
When the VMG has an IPv6 WAN address and you set
IPv6/IPv4 Mode
to
IPv6 Only
, you can
enable Dual Stack Lite to use IPv4 computers and services.
The VMG tunnels IPv4 packets inside IPv6 encapsulation packets to the ISP’s Address Family
Transition Router (AFTR in the graphic) to connect to the IPv4 Internet. The local network can also
use IPv6 services. The VMG uses it’s configured IPv6 WAN IP to route IPv6 traffic to the IPv6
Internet.
Figure 19
Dual Stack Lite
6.1.3
Before You Begin
You need to know your Internet access settings such as encapsulation and WAN IP address. Get this
information from your ISP.
ISP (IPv4)
IPv6 Internet
IPv4
IPv6
BR
IPv6 in IPv4
IPv4 Internet
IPv4
+
LAN
- IPv6
- IPv4
WAN
- IPv4
- IPv6 in IPv4
ISP (IPv6)
IPv6 Internet
IPv6
AFTR
IPv4 in IPv6
IPv4 Internet
IPv6
IPv4
+
LAN
- IPv6
- IPv4
WAN
- IPv6
- IPv4 in IPv6
Page 65 / 327
Chapter 6 Broadband
VMG3926-B10A User’s Guide
65
6.2
The Broadband Screen
Use this screen to change your VMG’s Internet access settings. Click
Network Setting
>
Broadband
from the menu. The summary table shows you the configured WAN services
(connections) on the VMG.
Figure 20
Network Setting > Broadband
The following table describes the labels in this screen.
Table 7
Network Setting > Broadband
LABEL
DESCRIPTION
Add New WAN
Interface
Click this button to create a new connection.
#
This is the index number of the entry.
Name
This is the service name of the connection.
Type
This shows whether it is an ATM, Ethernet or a PTM connection.
Mode
This shows whether the connection is in routing or bridge mode.
Encapsulation
This is the method of encapsulation used by this connection.
802.1p
This indicates the 802.1p priority level assigned to traffic sent through this connection. This
displays
N/A
when there is no priority level assigned.
802.1q
This indicates the VLAN ID number assigned to traffic sent through this connection. This
displays
N/A
when there is no VLAN ID number assigned.
IGMP Proxy
This shows whether the VMG act as an IGMP proxy on this connection.
NAT
This shows whether NAT is activated or not for this connection.
Default
Gateway
This shows whether the VMG use the WAN interface of this connection as the system default
gateway.
IPv6
This shows whether IPv6 is activated or not for this connection. IPv6 is not available when
the connection uses the bridging service.
MLD Proxy
This shows whether Multicast Listener Discovery (MLD) is activated or not for this
connection. MLD is not available when the connection uses the bridging service.
Modify
Click the
Edit
icon to configure the WAN connection.
Click the
Delete
icon to remove the WAN connection.

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