On the PPPoE server:
[Huawei-A-Virtual-Template10]display this
ppp authentication-mode chap
[Huawei-A-aaa]display this
local-user ub password simple user1
On the PPPoE client:
[Huawei-B-Dialer10]display this
ppp chap user ub
ppp chap password simple ub
dialer-group 5
[Huawei-B-GigabitEthernet0/0/1]display this
pppoe-client dial-bundle-number
10
[Huawei-B-dialer-rule]display this
dialer-rule
dialer-rule 5 ip permit
l If authentication is configured on the PPPoE server, check whether the user name and
password are correctly configured on the PPPoE client. If the dial-on-demand function is
configured on the PPPoE client, the PPP link is torn down when there is no traffic to be
transmitted. Ensure that the dialer-rule-number value in the dialer-rule command is the
same as the group-number value in the dialer-group command.
l If the preceding configurations are all correct but the fault persists, go to step 3.
Step 3 Find out the dial-in failure cause.
On the PPPoE client, check whether the PPP protocol frequently alternates between Up and
Down states because authentication fails. Run the following commands to check the displayed
information. The dialer interface is the dialup interface of the PPP connection.
<Huawei-B>terminal monitor
Info: Current terminal monitor is on.
<Huawei-B>terminal debugging
Info: Current terminal debugging is on.
Info: Current terminal monitor is on.
<Huawei-B>debugging ppp all interface Dialer 10
If the following information is displayed, authentication fails.
<Huawei-B>Jan 21 2008 17:40:56.420.1+08:00 AR1220-B MID_PPP/7/debug2:
PPP Packet:
Dialer10:0 Input CHAP(c223) Pkt, Len 33
State SendResponse, code FAILURE(04), id 2, len 29
Message: Illegal User or password.
<Huawei-B>Jan 21 2008 17:42:37.520.4+08:00 AR1220-B MID_PPP/7/debug2:
PPP Packet:
Dialer10:0 Output LCP(c021) Pkt, Len 13
State reqsent, code ConfRej(04), id 1, len 9
AuthProto(3), len 5, CHAP c22305
<Huawei-B>Jan 21 2008 17:42:37.530.6+08:00 AR1220-B MID_PPP/7/debug2:
PPP Packet:
Dialer10:0 Input LCP(c021) Pkt, Len 8
State opened, code TermReq(05), id 3, len 4
In the preceding command output, the first part of information indicates that a CHAP user name
is configured on the PPPoE client and the PPP client receives a Challenge message from the
PPPoE server and replies with a Response message. Because the CHAP password is incorrect
or the user name or password does not exist, the PPPoE server sends a Response Failed message
to the PPPoE client. The second part of information indicates that no authentication information
is configured on the PPPoE client or the authentication mode configured on the PPPoE client is
different from that configured on the PPPoE server so the client refuses the authentication request
from the server in LCP negotiation. If the client fails to be authenticated four times, the third
Huawei AR2200-S Series Enterprise Routers
Troubleshooting 5 WAN
Issue 01 (2012-01-06) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
115
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