PPPOE SERVER&CLIENT

University of Babylon, IT College
Information Network Dep., Third Class, Second Semester
MTCNA Course
MikroTik Certified Network Associate
2014-2015
By M.Sc. I.T Alaa A. Mahdi
• Dead: In the dead phase the link is not being used.
There is no active carrier (at the physical layer) and the
line is quiet.
• Establish: When one of the nodes starts the
communication, the connection goes into this phase. In
this phase, options are negotiated between the two
parties. If the negotiation is successful, the system goes
to the authentication phase (if authentication is
required) or directly to the networking phase. The link
control protocol packets, that will be discussed shortly,
are used for this purpose. Several packets may be
exchanged here.
Transition Phases
Point-to-point protocol
• In networking, the Point-to-Point Protocol
(PPP) is a data link protocol commonly
used in establishing a direct connection
between two networking nodes. It can
provide connection authentication,
transmission encryption and compression.
• PPP is used over many types of physical
networks including serial cable, phone line,
cellular telephone, radio links, and fiber
optic links.
• PPP is also used over Internet access
connections (now marketed as
"broadband").
Most encapsulated forms of PPP is Point-to-
Point Protocol over Ethernet (PPPoE)
which used most commonly by Internet
Service Providers (ISPs) to establish an
Internet service connection with customers.
• RFC 2516 describes Point-to-Point Protocol
over Ethernet (PPPoE) as a method for
transmitting PPP over Ethernet
• The PPPoE (Point to Point Protocol over
Ethernet) protocol provides extensive user
management, network management and
accounting benefits to ISPs and network
administrators. Currently PPPoE is used
mainly by ISPs to control client connections
for Ethernet networks. PPPoE is an
extension of the standard Point to Point
Protocol (PPP). The difference between
them is expressed in transport method:
PPPoE employs Ethernet instead of serial
modem connection.
Transition Phases
• Dead: In the dead phase the link is not being used.
There is no active carrier (at the physical layer) and the
line is quiet.
• Establish: When one of the nodes starts the
communication, the connection goes into this phase. In
this phase, options are negotiated between the two
parties. If the negotiation is successful, the system goes
to the authentication phase (if authentication is
required) or directly to the networking phase. The link
control protocol packets, that will be discussed shortly,
are used for this purpose. Several packets may be
exchanged here.
Transition Phases
• Authenticate: The authentication phase is optional; the two
nodes may decide, during the establishment phase, not to skip
this phase. However, if they decide to proceed with
authentication, they send several authentication packets. If the
result is successful, the connection goes to the networking phase;
otherwise, it goes to the termination phase.
• Network: In the network phase, negotiation for the network
layer protocols takes place. PPP specifies that two nodes establish
a network layer agreement before data at the network layer can be
exchanged. The reason is that PPP supports multiple protocols at
the network layer. If a node is running multiple protocols
simultaneously at the network layer, the receiving node needs to
know which protocol will receive the data.
Transition Phases
• Open: In the open phase, data transfer takes place.
When a connection reaches this phase, the exchange of
data packets can be started. The connection remains in
this phase until one of the endpoints wants to terminate
the connection.
• Terminate: In the termination phase the connection is
terminated. Several packets are exchanged between the
two ends for house cleaning and closing the link.
Transition Phases