ZyXEL Communications 792H manual Encapsulation and Multiplexing Scenarios, Remote Node Setup

Prestige 791R G.SHDSL Router

	Menu 11 - Remote Node Setup
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Figure 24-1 Remote Node Setup

24.2.1 Encapsulation and Multiplexing Scenarios

For Internet access you should use the encapsulation and multiplexing methods used by your ISP. For LAN-to-LAN applications, for example, between a branch office and corporate headquarters, prior agreement on methods is necessary because encapsulation and multiplexing cannot be automatically determined. What method(s) you use 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

aLAN-to-LAN application. Here are some examples of more suitable combinations in such an application.

Scenario 1. One VC, Multiple Protocols

PPPoA (RFC-2364) encapsulation with VC-basedmultiplexing is the best combination because no extra protocol identifying headers are needed. The PPP protocol already contains this information.

Scenario 2. One VC, One Protocol (IP)

Selecting RFC-1483encapsulation with VC-basedmultiplexing requires the least amount of overhead (0 octets). However, if there is a potential need for multiple protocol support in the future, it may be safer to select PPPoA encapsulation instead of RFC-1483, so you do not need to reconfigure either computer later.

Scenario 3. Multiple VCs

If you have an equal number (or more) of VCs than the number of protocols, then select RFC-1483encapsulation and VC-basedmultiplexing.

24-2 Remote Node TCP/IP Configuration