Справочник по сетевым протоколам


The Data field is zero


values are assigned as follows:

Value (in hex) Protocol

c023 Password Authentication Protocol

c223 Challenge Handshake Authentication Protocol


The Data field is zero or more octets, and contains additional

data as determined by the particular protocol.

6.3. Quality-Protocol


On some links it may be desirable to determine when, and how

often, the link is dropping data. This process is called link

quality monitoring.

This Configuration Option provides a method to negotiate the use

of a specific protocol for link quality monitoring. By default,

link quality monitoring is disabled.

The implementation sending the Configure-Request is indicating

that it expects to receive monitoring information from its peer.

If an implementation sends a Configure-Ack, then it is agreeing to

send the specified protocol. An implementation receiving a

Configure-Ack SHOULD expect the peer to send the acknowledged


There is no requirement that quality monitoring be full-duplex or

Simpson [Page 43]

RFC 1661 Point-to-Point Protocol July 1994

that the same protocol be used in both directions. It is

perfectly acceptable for different protocols to be used in each

direction. This will, of course, depend on the specific protocols


A summary of the Quality-Protocol Configuration Option format is

shown below. The fields are transmitted from left to right.

0 1 2 3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1


| Type | Length | Quality-Protocol |


| Data ...





>= 4


The Quality-Protocol field is two octets, and indicates the link

quality monitoring protocol desired. Values for this field are

always the same as the PPP Protocol field values for that same

monitoring protocol.

Up-to-date values of the Quality-Protocol field are specified in

Содержание  Назад  Вперед