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Knowledge Base

Incorrect Configuration of the Server Disables the AR28 to Access the Network Through ISDN Dialup

Publication Date:  2019-07-09  |   Views:  2  |   Downloads:  0  |   Author:  SU1000727569  |   Document ID:  EKB0000462115


Issue Description

 Networking: AR28 (outbound, ISDN 2B+D)-----AR46 (inbound, dialing server)
Fault symptom: The AR28 fails to connect to the AR46 through dialup. The PPP debugging information on the AR46 shows that the IPCP negotiation is successful but the AR46 considers that the IP address authentication fails. 


Alarm Information

 *0.176277132 BJ_DBJ_BMW_AR46-40-A PPP/8/debug2:
PPP State Change:
Dialer0:0 IPCP : acksent --> opened //The AR28 negotiates with the AR46 for parameters such as the IP address. When the negotiation succeeds, IPCP enters the open state.
*0.176277272 BJ_DBJ_BMW_AR46-40-A DCC/8/debug:DCC: link negotiation Up on interface Bri3/0/1:1
*0.176277392 BJ_DBJ_BMW_AR46-40-A DCC/8/debug:DCC: address authentication ERROR! Failed //IPCP negotiation of PPP at the last stage succeeds, but the AR46 considers that the IP address authentication fails. 


Handling Process

 Check the dialup configurations on the AR46.
interface Bri3/0/1
link-protocol ppp
dialer enable-circular
dialer-group 1
dialer circular-group 0
interface Dialer0
link-protocol ppp
ppp mp min-bind 2
ppp mp
ip address 10.0.x.x
dialer enable-circular
dialer-group 1
dialer threshold 0 in-out
remote address pool 1
dialer route ip 10.0.x.x 24 //It is confirmed by the R&D engineer that the dialer route is valid only when the AR46 serves as the dialer. If the AR46 is dialed and the dialer interface is configured with a primary IP address, routes to the network segment where the IP address of the dialer interface cannot be configured. Otherwise, the problem of IP address authentication failure occurs. After this configuration is removed, the AR28 successfully dials up to the AR46. 


Root Cause

 As the negotiation about PPP parameters succeeds, it is probably because that the AR46 restricts the incoming calls from the AR28. For example, ACL rules are configured.