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states
PPP line activation and states
The states of the Point to Point Protocol are such:
Dead (or idle), no active connection or carrier.
Establish, where Link Control Protocol negotiation begins.
Authenticate, where two terminal points authenticate each other. Either PAP, or
CHAP protocol comes in use at this point.
Network, where the appropriate Network Control Protocol is invoked. IPCP is used
to establish IP service over the network
Open, where data transport takes place.
Terminate, where the connection requires termination
Multilink PPP
Multilink PPP can connect multiple links between two systems as needed to
provide extra bandwidth. Remotely accessing resources through PPP Multilink
allows for the increase in overall throughput by combining the bandwidth of two
or more physical communication links such as analog modems, ISDN, and other
analog/digital links. PPP Multilink is based on Internet Engineering Task Force
(IETF) standard RFC 1990 (obsoletes RFC 1717).
See also: Inverse multiplexer
Multiclass PPP
MP's monotonically increasing sequence numbering (contiguous numbers are needed
for all fragments of a packet) does not allow suspension of the sending of a
sequence of fragments of one packet in order to send another packet. The obvious
approach to providing more than one level of suspension with PPP Multilink is to
run Multilink multiple times over one link. Multilink as it is defined provides
no way for more than one instance to be active. Each class runs a separate copy
of the mechanism defined i.e. uses a separate sequence number space and
reassembly buffer. See RFC 2686.
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