No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search


To have a better experience, please upgrade your IE browser.


AR Router Troubleshooting Guide

This Product Documentation provides guidance for maintaining AR Enterprise Router, covering common information collection and fault diagnostic commands, typical fault troubleshooting guide, and troubleshooting.
Rate and give feedback :
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
PAP Authentication Failure on a PPPoE Dialer Interface

PAP Authentication Failure on a PPPoE Dialer Interface

This section provides a troubleshooting case for the following fault: When the PPPoE client function is configured on an AR router, PAP authentication between the PPPoE client and the PPPoE server fails through the dialer interface.


As shown in Figure 1, LAN users are connected to the device through GE1/0/0 and the device is connected to the PPPoE server through GE2/0/0.

Figure 17-12  Device functioning as a PPPoE client

The dial-up configuration is as follows:

interface Dialer1
 link-protocol ppp
 ppp authentication-mode pap
 ppp chap user test@wxdsl ppp chap password cipher %^%#qP|KT<)}l6&MrG05Q\P$dx,-#9Y5q+Bw6L<Hb2SQ%^%# 
 ppp pap local-user user@domain password simple wenet 
 ppp ipcp dns admit-any 
 ppp ipcp dns request 
 tcp adjust-mss 1200 
 ip address ppp-negotiate 
 dialer user 
 dialer bundle 3 
 dialer-group 3 
interface GigabitEthernet2/0/0.1
 pppoe-client dial-bundle-number 3
 mtu 1472 
 description UNET 
 dot1q termination vid 6 dot1q vrrp vid 6

Fault Description

Authentication between the PPPoE client and the PPPoE server fails.

Fault Analysis

  1. PAP and CHAP authentication modes are configured on the dialer1 interface, so the preceding problem is not caused due to the authentication mode.
  2. After the authentication mode of the remote device is checked, it is found that the remote device unidirectionally controls the PAP authentication connection request, but bidirectional PAP authentication is configured on the device.


Disable the PPPoE client from functioning as the authenticating device in PAP authentication mode on the dialer1 interface.

<Huawei> system-view 
[Huawei] interface dialer 1 
[Huawei-Dialer1] undo ppp authentication-mode pap

Conclusions and Suggestions

PAP authentication includes unidirectional and bidirectional PAP authentication.

  • In unidirectional PAP authentication, a device on one end functions as the authenticating device, and a device on the other end functions as the authenticated device.
  • In bidirectional PAP authentication, devices on both ends function as the authenticating and authenticated devices.

    If the remote device cannot function as the authenticated device, the local device fails to establish a link for authentication.

Updated: 2019-05-10

Document ID: EDOC1000079719

Views: 446736

Downloads: 4301

Average rating:
This Document Applies to these Products
Related Documents
Related Version
Previous Next