How your Nokia M11 works
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Copyright Nokia Networks Oy
C33833001SE_00
6-7
Network control protocols establish and configure different network
layer protocols, such as TCP/IP.
PPP encapsulation provides transmission of different network layer
protocols simultaneously over the same link. Once a PPP link has been
established, a PPP peer can negotiate the exchange of TCP/IP, IPX or
Appletalk packets over the serial connection. Your M11 supports
transmission of both IP (RFC 1332) and Ethernet (RFC 1638) packets
over the PPP link.
The setup of a PPP link consists of the following phases:
D
Link establishment
D
Link configuration
D
Authentication
D
Network configuration
D
Link up
During the link establishment, M11 synchronises its ADSL and ATM
transmission to open a physical layer connection between Nokia M11
and the remote peer router through the ATM access network. When the
physical connection has been established, the PPP protocol can
actually begin its work.
The next step is the PPP link configuration, which is done using a Link
configuration Protocol (LCP). It allows optional modifications to the
standard characteristics of the PPP link to be negotiated. Negotiable
items are, for example, the maximum receive unit (MRU) and link
authentication.
After link configuration, an authentication is performed using either
Password Authentication Protocol (PAP) or Challenge Handshake
Authentication Protocol (CHAP) if required or configured. If the
authentication succeeds, the next step in PPP link establishment is the
negotiation of network protocols which will be transferred over the
PPP link. After this the link is up and running.
6.8.1
Authentication
The PPP protocol suite includes two optional authentication methods.
Password Authentication Protocol (PAP) and Challenge Handshake
Authentication Protocol (CHAP) ensure that unauthorised users do not
have access to the network services. By default, authentication is not
required as part of the PPP link process. However, if a peer requires
authentication, it must negotiate the use of an authentication protocol
during the link establishment phase.
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