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PPP Troubleshooting 113
are mentioned together because they are often implemented simultaneously. Example 5-6
shows screen output from the commands.
As is noted in the output, this is an example of a failed CHAP authentication attempt.
Chapter 6 covers additional show and debug commands for PPP.
Example 5-6
Combined debug ppp negotiation and debug ppp authentication Command Output
ppp: sending CONFREQ, type = 3 (CI_AUTHTYPE), value = C223/5
ppp: sending CONFREQ, type = 5 (CI_MAGICNUMBER), value = 28CEEF99
ppp: received config for type = 3 (AUTHTYPE) value = C223 value = 5 acked
ppp: received config for type = 5 (MAGICNUMBER) value = 1E23F5C acked
PPP BRI0: B-Channel 1: state = ACKSENT fsm_rconfack(C021): rcvd id E4
ppp: config ACK received, type. = 3 (CI_AUTHTYPE), value = C223
ppp: config ACK received, type = 5 (CI_MAGICNUMBER), value = 28CEEF99
BRI0: B-Channel 1: PPP AUTH CHAP input code = 1 id = 82 len = 16
BRI0: B-Channel 1: PPP AUTH CHAP input code = 2 id = 95 len = 28
BRI0: B-Channel 1: PPP AUTH CHAP input code = 4 id = 82 len = 21
BRI0: B-Channel 1: Failed CHAP authentication with remote.
Remote message is: MD compare failed
ppp: sending CONFREQ, type = 3 (CI_AUTHTYPE), value = C223/5
ppp: sending CONFREQ, type = 5 (CI_MAGICNUMBER), value = 28CEEFDB
%LINK-3-UPDOWN: Interface BRI0: B-Channel 1, changed state to down
%LINK-5-CHANGED: Interface BRI0: B-Channel 1, changed state to down
%LINK-3-UPDOWN: Interface BRI0: B-Channel 1, changed state to up
%LINK-5-CHANGED: Interface BRI0: B-Channel 1, changed state to up
ppp: sending CONFREQ, type = 3 (CI_AUTHTYPE), value = C223/5
ppp: sending CONFREQ, type = 5 (CI_MAGICNUMBER), value = 28CEF76C
ppp: received config for type = 3 (AUTHTYPE) value = C223 value = 5 acked
ppp: received conf.ig for type = 5 (MAGICNUMBER) value = 1E24718 acked
PPP BRI0: B-Channel 1: state = ACKSENT fsm_rconfack(C021): rcvd id E6
ppp: config ACK received, type = 3 (CI_AUTHTYPE), value = C223
ppp: config ACK received, type = 5 (CI_MAGICNUMBER), value = 28CEF76C
BRI0: B-Channel 1: PPP AUTH CHAP input code = 1 id = 83 len = 16
BRI0: B-Channel 1: PPP AUTH CHAP input code = 2 id = 96 len = 28
BRI0: B-Channel 1: PPP AUTH CHAP input code = 4 id = 83 len = 21
BRI0: B-Channel 1: Failed CHAP authentication with remote.
Remote message is: MD compare failed