From: Hai Minh (minh@ipmac.com.vn)
Date: Tue May 17 2005 - 05:11:27 GMT-3
Hi group,
I'm testing ISDN and I found something strange.
On BRI, I set the encapsulation type is HDLC, and on interface Dialer, I set
PPP. I use PAP authentication, but I think PAP won't work because on the
encapsulation on the physical interface is HDCL.
Here is my configuration.
R6
interface BRI0
no ip address
dialer pool-member 1
isdn switch-type basic-ni
isdn spid1 66612345
isdn spid2 66654321
cdapi buffers regular 0
cdapi buffers raw 0
cdapi buffers large 0
!
interface Dialer1
ip address 10.1.68.6 255.255.255.0
encapsulation ppp
dialer pool 1
dialer string 888111
dialer-group 1
ppp authentication pap
!
But when I try to connect, it still authenticates the remote router. And the
biggest surprise is it uses CHAP (see the debug below). It should not
authenticate. Then I reconfigure PPP on physical interface and connect again,
this time it authenticate by PAP as I wish.
I don't know how it can use CHAP to authenticate when the encapsulation type
is HDCL on the physical interface. I check on DocCD but I can't find any word
talk about it. Is CHAP the default encapsulation type when I configure like
that??
Did anyone catch this problem?
R6#debug ppp authen
PPP authentication debugging is on
R6#ping 10.1.68.8
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.68.8, timeout is 2 seconds:
05:33:45: %LINK-3-UPDOWN: Interface BRI0:1, changed state to up
05:33:45: BR0:1 PPP: Treating connection as a callout
05:33:45: %DIALER-6-BIND: Interface BR0:1 bound to profile Di1.
05:33:45: BR0:1 PPP: Treating connection as a callout
05:33:45: BR0:1 CHAP: O CHALLENGE id 9 len 23 from "R6"
05:33:45: BR0:1 CHAP: I RESPONSE id 9 len 23 from "R8"
05:33:45: BR0:1 CHAP: O SUCCESS id 9 len 4!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 36/36/36 ms
R6#
05:33:46: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, changed
state to up
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