C
ONFIGURATION
S
ETTINGS
3-11
• PPPoE VC-Mux. Point to Point Protocol over Ethernet Virtual Circuit
Multiplexer uses PPP to bridge multiprotocol traffic over Ethernet to
the ISP’s router. Each PPP connection first learns the Ethernet address
of its remote peer, and then establishes a unique session identifier.
• PPPoE LLC. Point to Point Protocol over Ethernet Logical Link
Control allows multiple protocols running over one virtual circuit with
a little bit more overhead
• PPPoE None.
Your service provider will tell you which connection type to use.
Protocol Multiplexing
Protocol multiplexing allows you access a remote site using protocols such
as IP, Novell IPX, or Windows NetBuei networks just as though you were
attached to the local LAN. Also, note that all broadcast and multicast
frames entering the LAN port are always forwarded to the ADSL port.
Some of the encapsulation methods provided by this router support two
methods for carrying traffic over an ATM connection. LLC (Logical Link
Control) Encapsulation allows multiplexing of multiple protocols over a
single virtual circuit, where each data packet contains an extra field
identifying the protocol. While VC Based Multiplexing carries each
protocol over a separate virtual circuit and therefore does not need to
include any explicit information identifying the protocol type.
Since VC multiplexing does not include the additional protocol identifiers
used in LLC encapsulation, you should use this method whenever possible
to maximize bandwidth utilization. If your ISP only supports one Virtual
Circuit, use VC multiplexing unless more than one protocol is carried over
the link. You should also use VC multiplexing with encapsulation methods
such as IP/ATM which only requires one transport protocol.