From: Grant Patten (gpatten@xxxxxxxxxx)
Date: Tue May 08 2001 - 14:12:22 GMT-3
I'm struggling to get a good understanding of how exactly CHAP
Authentication works. I think I'm missing something fundamental and
hopefully one of you can help me out. Thanks.
When I use the configuration below, I get the following debug messages:
1d15h: BR0:1 PPP: Treating connection as a callout
1d15h: BR0:1 PPP: Phase is AUTHENTICATING, by both
1d15h: BR0:1 CHAP: Using alternate hostname ISDN2
1d15h: BR0:1 CHAP: O CHALLENGE id 14 len 26 from "ISDN2"
1d15h: BR0:1 CHAP: I CHALLENGE id 14 len 26 from "ISDN1"
1d15h: BR0:1 CHAP: Using alternate hostname ISDN2
.d15h: BR0:1 CHAP: O RESPONSE id 14 len 26 from "ISDN2"
1d15h: BR0:1 CHAP: I FAILURE id 14 len 25 msg is "MD/DES compare failed"
Here is the relevant portions of the configs I'm using on R1 and R2. I
changed the encrypted ppp chap password to what I actually set:
R2
hostname R2
!
!
username ISDN1 password 0 CCIE
!
!
interface BRI0
ip address 147.10.1.2 255.255.255.0
no ip directed-broadcast
encapsulation ppp
dialer map ip 147.10.1.1 name ISDN1 broadcast 8358661
dialer-group 1
isdn switch-type basic-ni
isdn spid1 0835866201
isdn spid2 0835866401
ppp authentication chap
ppp chap hostname ISDN2
ppp chap password cisco
R1
hostname R1
!
!
username ISDN2 password 0 cisco
!
interface BRI0
ip address 147.10.1.1 255.255.255.0
no ip directed-broadcast
encapsulation ppp
dialer map ip 147.10.1.2 name ISDN2 broadcast
dialer-group 1
isdn switch-type basic-ni
isdn spid1 0835866101
isdn spid2 0835866301
ppp authentication chap
ppp chap hostname ISDN1
ppp chap password CCIE
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