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Configuring PPP Services
2-8 117360-A Rev. A
Authenticating the PPP Link: PAP and CHAP
In the authentication phase of PPP initialization, one or both peer routers enable
either Password Authentication Protocol (PAP) or Challenge Handshake
Authentication Protocol (CHAP). Authentication is optional for leased lines but
required for switched (dial-up) lines. You can optionally specify a time limit for
authentication on switched lines.
Password Authentication Protocol
PAP imposes network security by requiring the peer router to send a PAP packet
that contains a plain-text user identifier and password to the originating router
before the interface can advance to the network layer protocol phase.
If PAP fails, the network administrator must change the identifier and password on
both peer routers and disable and reenable LCP to reinitialize the line.
Challenge Handshake Authentication Protocol
CHAP imposes network security by requiring that the peers share a plain-text
secret. The originating peer sends a challenge message to its receiving peer. The
receiving peer responds with a value it calculates on the basis of knowing the
secret. The first peer then matches the response against its own calculation of what
the response should be. If the values match, it sends a success message, and the
LCP establishes the link.
CHAP uses an incrementally changing identifier and a variable challenge value to
provide network security. It also allows for repeated challenges at intervals that
either router on a link can specify. A router may transmit challenge packets not
only during the link establishment phase, but also at any time during the network
layer protocol phase to ensure that the connection retains its integrity.
If CHAP fails, the network administrator must change the identifiers and secret on
both peer routers and disable and reenable LCP to reinitialize the line.
Note: For all dial services, you must use PAP or CHAP, either of which
provides an identification mechanism that is essential to bringing up
dial-on-demand, bandwidth-on-demand, and dial backup lines. Failure of
either authentication protocol causes the connection to be dropped, without the
network administrator’s intervention.
- Configuring PPP 1
- Services 1
- Contents 5
- 117360-A Rev. A 11
- About This Guide 13
- Conventions 14
- Acronyms 15
- Bay Networks Customer Service 17
- How to Get Help 17
- Chapter 1 19
- Starting PPP Services 19
- Summary of PPP Services 20
- Starting Configuration Tools 21
- Starting PPP 22
- Using the BCC 23
- Using Site Manager 23
- Deleting PPP Services 24
- Where to Go Next 25
- Chapter 2 27
- PPP Concepts 27
- PPP Overview 28
- • Password Authentication 29
- • Challenge Handshake 29
- Routing over a PPP Link 30
- Initializing a PPP Interface 31
- 2-6 117360-A Rev. A 32
- 2-8 117360-A Rev. A 34
- One-Way Authentication 35
- Datagram Encapsulation 36
- PPP Dial Services Support 36
- Dial-on-Demand 37
- Bandwidth-on-Demand 37
- Dial Backup 37
- PPP Multiline 38
- PPP Multilink 38
- Using PPP Multilink 39
- 2-14 117360-A Rev. A 40
- Figure 2-4. Multilink Circuit 40
- Balancing Traffic Loads 41
- Using Multilink Fragmentation 42
- 2-18 117360-A Rev. A 44
- Monitoring PPP Link Quality 46
- PPP Data Compression 48
- PPP Line Parameters 50
- Detecting Loopback Conditions 51
- 2-26 117360-A Rev. A 52
- PPP Interoperability 53
- Chapter 3 55
- Customizing PPP 55
- 3-2 117360-A Rev. A 56
- Enabling PPP on an Interface 57
- Setting Up Remote Addresses 58
- Configuring AppleTalk 60
- 3-8 117360-A Rev. A 62
- 3-10 117360-A Rev. A 64
- Table 3-1. PPP Modes 65
- 3-12 117360-A Rev. A 66
- Configuring Data Encryption 67
- Customizing PPP Lines 68
- Editing PPP Line Parameters 69
- Setting the Restart Timer 72
- Customizing PAP 81
- Customizing CHAP 84
- 3-34 117360-A Rev. A 88
- 3-36 117360-A Rev. A 90
- Disabling Loopback Checking 93
- 3-42 117360-A Rev. A 96
- Appendix A 99
- Configuring PPP Services 100
- A-2 117360-A Rev. A 100
- 101
- A-8 117360-A Rev. A 106
- PPP Parameters 107
- 110
- A-16 117360-A Rev. A 114
- 116
- A-20 117360-A Rev. A 118
- 119
- A-24 117360-A Rev. A 122
- A-26 117360-A Rev. A 124
- A-28 117360-A Rev. A 126
- Appendix B 127
- Default PPP Configuration 127
- B-2 117360-A Rev. A 128
- Default PPP Configuration 129
- Appendix C 131
- PPP Statistics 131
- C-2 117360-A Rev. A 132
- Table C-1. PPP Statistics 132
- 117360-A Rev. A Index-1 133
- 117360-A Rev. A Index-3 135
- 117360-A Rev. A Index-5 137
- 117360-A Rev. A Index-7 139
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