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Chapter 2: Planning Your Network
The Gateway’s Functions
ADSL2+ Gateway with VoIP
Chapter 2: Planning Your Network
The Gateway’s Functions
A Gateway is a network device that connects two networks together.
In this instance, the Gateway connects your Local Area Network (LAN), or the group of computers in your home or
office, to the Internet. The Gateway processes and regulates the data that travels between these two networks.
The Gateway’s NAT feature protects your network of computers so users on the public, Internet side cannot “see”
your computers. This is how your network remains private. The Gateway protects your network by inspecting
every packet coming in through the Internet port before delivery to the appropriate computer on your network.
The Gateway inspects Internet port services like the web server, ftp server, or other Internet applications, and, if
allowed, it will forward the packet to the appropriate computer on the LAN side.
Remember that the Gateway’s ports connect to two sides. The LAN ports connect to the LAN, and the ADSL port
connects to the Internet. The LAN ports transmit data at 10/100Mbps.
IP Addresses
What’s an IP Address?
IP stands for Internet Protocol. Every device on an IP-based network, including computers, print servers, and
Gateways, requires an IP address to identify its “location,” or address, on the network. This applies to both the
Internet and LAN connections. There are two ways of assigning an IP address to your network devices. You can
assign static IP addresses or use the Gateway to assign IP addresses dynamically.
Static IP Addresses
A static IP address is a fixed IP address that you assign manually to a computer or other device on the network.
Since a static IP address remains valid until you disable it, static IP addressing ensures that the device assigned
it will always have that same IP address until you change it. Static IP addresses must be unique and are
commonly used with network devices such as server computers or print servers.
NOTE: Since the Gateway is a device that connects
two networks, it needs two IP addresses—one for
the LAN, and one for the Internet. In this User Guide,
you’ll see references to the “Internet IP address”
and the “LAN IP address.”
Since the Gateway uses NAT technology, the only IP
address that can be seen from the Internet for your
network is the Gateway’s Internet IP address.
However, even this Internet IP address can be
blocked, so that the Gateway and network seem
invisible to the Internet—see the Block WAN
Requests description under Security in “Chapter 6:
Configuring the ADSL2+ Gateway.”
Figure 2-1: Network
ip (internet protocol): a protocol used to send data
over a network
- ADSL2+ Gateway 1
- How to Use this Guide 2
- Copyright and Trademarks 2
- Table of Contents 3
- List of Figures 5
- Chapter 1: Introduction 7
- What’s in this User Guide? 8
- The Gateway’s Functions 9
- IP Addresses 9
- Dynamic IP Addresses 10
- Back Panel 11
- ADSL2+ Gateway with VoIP 12
- Overview 13
- Action Command (press these 16
- Choices Description 16
- Entering a Password 19
- Security 21
- Access Restrictions 21
- Applications & Gaming 21
- Administration 21
- The Setup - Basic Setup Tab 22
- VC Settings 23
- IP Settings 23
- Static IP 24
- RFC 1483 Routed 24
- RFC 2516 PPPoE 25
- RFC 2364 PPPoA 25
- Bridged Mode Only 26
- Network Setup 26
- The Setup - DDNS Tab 28
- Advanced Routing 29
- PVC Routing Policy 30
- The Setup - Voice Tab 31
- Line 1 Status 32
- PSTN Line Status 33
- The Voice - System Screen 35
- The Voice - User 1 Screen 36
- Distinctive Ring Settings 37
- Ring Settings 37
- The Voice - PSTN User Screen 38
- The Security - Firewall Tab 39
- The Security - VPN Tab 40
- Single Port Forwarding 45
- PVC QoS Priority 47
- Edit list of QoS Settings 48
- Gateway Access 49
- Remote Upgrade 50
- SNMPv1/v2c 50
- SNMPv3 Security 50
- Trap Management 50
- IGMP-Proxy 51
- IGMP-Snooping 51
- Reporting 52
- Ping Test 53
- Backup Configuration 53
- Restore Configuration 53
- Factory Defaults 54
- Upgrade from LAN 54
- The Status - Gateway Tab 55
- DSL Status 56
- PVC Connection 56
- Appendix A: Troubleshooting 57
- For Windows 2000: 58
- For Windows XP: 58
- Common Problems and Solutions 61
- For Netscape 4.7 or higher: 63
- Frequently Asked Questions 66
- Ethernet Adapter 70
- Appendix D: Glossary 73
- Appendix E: Specifications 78
- ADSL Gateway 82
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