Tsunami
®
800 & 8000 Series - Software Management Guide 69
5.2.5 PPPoE End Point (SU Only)
Proxim’s SU devices support Point-to-Point Protocol over Ethernet (PPPoE) which is a network protocol for transmitting
PPP frames over Ethernet. This feature is commonly used by Internet Service Providers (ISPs) to establish a Digital Subscriber
Line (DSL) Internet service connection with clients.
The Proxim’s SU devices support PPPoE only when they are configured in Routing Mode with NAT enabled. Also, the BSU
should always operate in Bridge Mode.
Figure 5-16 PPPoE Architecture
Given below are the stages for a PPPoE client to establish link with the PPPoE server and then transfer PPP frames over
Ethernet:
·
Discovery and Session Stage: In this stage, to initiate a PPPoE session, the PPPoE client discovers a PPPoE server
(called Access Concentrator). Once discovered, a session ID is assigned and a session is established.
·
Point-to-point Protocol (PPP) Stages: The PPP stage comprises the following sub-stages:
1. Physical Link: For sending and receiving PPP frames, the PPP driver calls the services of PPP Channels (used in
connection with serial links). A PPP channel encapsulates a mechanism for transporting PPP frames from one
machine to another and then the frames are forwarded on the physical Ethernet link.
2. Link Establishment: In this stage, Link Configuration Protocol (LCP) performs the basic setup of the link. As part
of this setup, the configuration process is undertaken whereby the PPPoE client and the server negotiate and
agree on the parameters on how data should be passed between them. Only when both the client and server
come to an agreement, the link is considered to be open and will proceed to the Authentication stage.
3. Authentication: In this stage, LCP invokes an authentication protocol (PAP/CHAP/MS CHAP v2/EAP-MD5) when
PPP is configured to use authentication.
4. Encryption: In this stage, both PPPoE client and server negotiate the encryption protocol configuration. Our
device support MPPE as encryption protocol. MPPE is negotiated within option 18 in the PPP Compression Control
Protocol (CCP).
5. Network Layer Protocol: After successful authentication, the link proceeds to the Network-Layer Protocol stage.
In this stage, the specific configuration of the appropriate network layer protocol is performed by invoking the
appropriate Network Control Protocol (NCP) such as IPCP. We support only IPCP Protocol as a part of NCP.
Given below are the features supported by PPPoE client:
·
Preferred Server Configuration by using Access Concentrator Name/Service Name
·
PAP/CHAP/MSCHAP v2/EAP-MD5 Authentication Protocols
·
IP Configuration: Static IP/ PPPoE-IPCP
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