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Chapter 5 WAN Setup
P-660HWP-D1 User’s Guide
74
5.1.1.3 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 P-660HWP-D1 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.
5.1.1.4 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.
5.1.2 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.
5.1.2.1 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.
5.1.2.2 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.
5.1.3 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.
5.1.3.1 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.
Содержание P-660HWP-D1
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Страница 7: ...Safety Warnings P 660HWP D1 User s Guide 7...
Страница 8: ...Safety Warnings P 660HWP D1 User s Guide 8...
Страница 10: ...Contents Overview P 660HWP D1 User s Guide 10...
Страница 20: ...Table of Contents P 660HWP D1 User s Guide 20...
Страница 26: ...List of Figures P 660HWP D1 User s Guide 26...
Страница 31: ...31 PART I Introduction Introducing the P 660HWP D1 33 Introducing the Web Configurator 41...
Страница 32: ...32...
Страница 39: ...Chapter 1 Introducing the P 660HWP D1 P 660HWP D1 User s Guide 39 Figure 7 P 660HWP D1 with ISDN...
Страница 40: ...Chapter 1 Introducing the P 660HWP D1 P 660HWP D1 User s Guide 40...
Страница 54: ...Chapter 2 Introducing the Web Configurator P 660HWP D1 User s Guide 54 Figure 19 System General...
Страница 55: ...55 PART II Wizards Wizard Setup for Internet Wireless Access 57 Bandwidth Management Wizard 69...
Страница 56: ...56...
Страница 72: ...72...
Страница 90: ...Chapter 5 WAN Setup P 660HWP D1 User s Guide 90...
Страница 147: ...147 PART IV Security Firewalls 149 Firewall Configuration 161 Content Filtering 183 Certificates 187...
Страница 148: ...148...
Страница 168: ...Chapter 11 Firewall Configuration P 660HWP D1 User s Guide 168 Figure 93 Firewall Edit Rule...
Страница 182: ...Chapter 11 Firewall Configuration P 660HWP D1 User s Guide 182...
Страница 186: ...Chapter 12 Content Filtering P 660HWP D1 User s Guide 186...
Страница 210: ...210...
Страница 214: ...Chapter 14 Static Route P 660HWP D1 User s Guide 214...
Страница 230: ...Chapter 16 Dynamic DNS Setup P 660HWP D1 User s Guide 230...
Страница 242: ...Chapter 17 Remote Management Configuration P 660HWP D1 User s Guide 242...
Страница 254: ...Chapter 18 Universal Plug and Play UPnP P 660HWP D1 User s Guide 254...
Страница 255: ...255 PART VI Maintenance and Troubleshooting System 257 Logs 263 Tools 281 Diagnostic 287 Troubleshooting 289...
Страница 256: ...256...
Страница 262: ...Chapter 19 System P 660HWP D1 User s Guide 262...
Страница 280: ...Chapter 20 Logs P 660HWP D1 User s Guide 280...
Страница 286: ...Chapter 21 Tools P 660HWP D1 User s Guide 286...
Страница 296: ...296...
Страница 340: ...Appendix D IP Subnetting P 660HWP D1 User s Guide 340...
Страница 344: ...Appendix E Command Interpreter P 660HWP D1 User s Guide 344...
Страница 360: ...Appendix H Legal Information P 660HWP D1 User s Guide 360...
Страница 366: ...Appendix I Customer Support P 660HWP D1 User s Guide 366...
Страница 374: ...Index P 660HWP D1 User s Guide 374...