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Reference Manual for the MR814v2 Cable/DSL Wireless Router
B-2 Network, Routing, Firewall, and Basics
What is a Router?
A router is a device that forwards traffic between networks based on network layer information in
the data and on routing tables maintained by the router. In these routing tables, a router builds up a
logical picture of the overall network by gathering and exchanging information with other routers
in the network. Using this information, the router chooses the best path for forwarding network
traffic.
Routers vary in performance and scale, number of routing protocols supported, and types of
physical WAN connection they support. The MR814v2 Cable/DSL Wireless Router is a small
office router that routes the IP protocol over a single-user broadband connection.
Routing Information Protocol
One of the protocols used by a router to build and maintain a picture of the network is the Routing
Information Protocol (RIP). Using RIP, routers periodically update one another and check for
changes to add to the routing table.
The MR814v2 router supports both the older RIP-1 and the newer RIP-2 protocols. Among other
improvements, RIP-2 supports subnet and multicast protocols. RIP is not required for most home
applications.
IP Addresses and the Internet
Because TCP/IP networks are interconnected across the world, every machine on the Internet must
have a unique address to make sure that transmitted data reaches the correct destination. Blocks of
addresses are assigned to organizations by the Internet Assigned Numbers Authority (IANA).
Individual users and small organizations may obtain their addresses either from the IANA or from
an Internet service provider (ISP). You can contact IANA at www.iana.org.
The Internet Protocol (IP) uses a 32-bit address structure. The address is usually written in dot
notation (also called dotted-decimal notation), in which each group of eight bits is written in
decimal form, separated by decimal points.
For example, the following binary address:
11000011 00100010 00001100 00000111
is normally written as:
195.34.12.7
- Reference Manual for the 1
- MR814v2 Cable/DSL 1
- Wireless Router 1
- Trademarks 2
- Statement of Conditions 2
- Contents 5
- Preface 11
- About This Manual 11
- Special Message Formats 12
- Chapter 1 13
- Introduction 13
- 1-2 Introduction 14
- Security 15
- Extensive Protocol Support 15
- Maintenance and Support 16
- Package Contents 17
- The Router’s Front Panel 18
- The Router’s Rear Panel 19
- 1-8 Introduction 20
- Chapter 2 21
- Cable or DSL modem 24
- Cable or 25
- DSL modem 25
- PPPoE Wizard-Detected Option 28
- Chapter 7, “Troubleshooting.” 32
- ISP Does Not Require Login 33
- ISP Does Require Login 33
- Chapter 3 37
- Wireless Configuration 37
- Wireless Data 38
- Security Options 38
- Range: Up to 500 Feet 38
- Wireless Configuration 3-3 39
- Wireless Configuration 3-5 41
- 3-6 Wireless Configuration 42
- Wireless Configuration 3-7 43
- Configure WEP 46
- 3-12 Wireless Configuration 48
- Chapter 4 49
- Content Filtering 49
- 4-2 Content Filtering 50
- Figure 4-1: Block Sites menu 50
- Content Filtering 4-3 51
- 4-4 Content Filtering 52
- Content Filtering 4-5 53
- Figure 4-4: Schedule menu 53
- 4-6 Content Filtering 54
- Figure 4-5: Logs menu 54
- Content Filtering 4-7 55
- Figure 4-6: Email menu 55
- Table 4-2. Log action buttons 55
- 4-8 Content Filtering 56
- Chapter 5 57
- Maintenance 57
- 5-2 Maintenance 58
- Maintenance 5-3 59
- 5-4 Maintenance 60
- Upgrading the Router Software 61
- Configuration File Management 62
- Maintenance 5-7 63
- Erasing the Configuration 64
- Chapter 6 65
- Adding a Custom Service 66
- Setting the MTU Size 69
- Using Address Reservation 72
- Using a Dynamic DNS Service 73
- Configuring Static Routes 74
- Figure 6-6. UPnP Menu 78
- Chapter 7 81
- Troubleshooting 81
- LEDs Never Turn Off 82
- LAN or WAN Port LEDs Not On 82
- Troubleshooting 7-3 83
- 7-6 Troubleshooting 86
- Problems with Date and Time 87
- 7-8 Troubleshooting 88
- Appendix A 89
- Technical Specifications 89
- A-2 Technical Specifications 90
- Interface Specifications 90
- Appendix B 91
- IP Addresses and the Internet 92
- 192.0.1.x to 223.255.254.x 94
- Subnet Addressing 95
- Table 7-2. Netmask Formats 96
- Private IP Addresses 97
- Related Documents 99
- IP Configuration by DHCP 100
- What is a Firewall? 101
- Ethernet Cabling 102
- Cable Quality 103
- Appendix C 105
- Preparing Your Network 105
- C-2 Preparing Your Network 106
- Windows 95B, 98, and Me 108
- Preparing Your Network C-5 109
- Verifying TCP/IP Properties 110
- Preparing Your Network C-7 111
- C-8 Preparing Your Network 112
- Preparing Your Network C-9 113
- C-10 Preparing Your Network 114
- Preparing Your Network C-11 115
- C-12 Preparing Your Network 116
- Preparing Your Network C-13 117
- Properties button 118
- 3. Type ipconfig /all 119
- MacOS 8.6 or 9.x 120
- 4. Click Save 121
- Are Login Protocols Used? 122
- 4. Select the IP Address tab 123
- 5. Select the Gateway tab 123
- Computers 124
- Restarting the Network 125
- C-22 Preparing Your Network 126
- Appendix D 127
- Wireless Networking Basics 127
- Authentication and WEP 129
- Open System Authentication 130
- Shared Key Authentication 130
- Overview of WEP Parameters 131
- Key Size 132
- Wireless Channels 133
- Glossary 135
- 2 Glossary 136
- 4 Glossary 138
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