F3726, F3211, F3174, R5135, R3816-HP Firewalls and UTM Devices Network Management Configuration Guide-6PW100

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PPP configuration examples
Typically, PPP works together with PPPoE and L2TP. For configuration examples, see "2320HConfiguring PPPoE"
and VPN Configuration Guide.
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Troubleshooting PPP configuration
457BSymptom 1
PPP authentication always fails, preventing the link from going up.
1171BSolution
This problem may occur if the parameters for authentication are incorrect.
• Enable the debugging of PPP, and you can see the information describing that LCP went up upon a
successful LCP negotiation but went down after PAP or CHAP negotiation.
• Check the PPP authentication settings at the local and peer ends to make sure that they are
consistent. See "
2321HConfiguring PAP authentication" and "2322HConfiguring CHAP authentication" for
reference.
458BSymptom 2
Configure an IPv6 address on an interface with PPP encapsulation enabled when IPv6 is disabled. The
PPP link fails IPv6CP negotiation and cannot go up. After enabling IPv6, the interface still cannot go up.
The following matrix shows the feature and hardware compatibility:
Hardware IPv6 and IPv6CP ne
g
otiation features com
p
atible
F1000-A-EI/F1000-S-EI Yes
F1000-E Yes
F5000 Yes
Firewall module Yes
U200-A Yes
U200-S No
1172BAnalysis
IPv6CP negotiation cannot succeed when IPv6 is disabled. As IPv6CP does not support renegotiation,
IPv6CP negotiation cannot succeed even if you enable IPv6 subsequently.
1173BSolution
Do the following:
• Enable IPv6 before configuring an IPv6 address on a PPP link.
• If IPv6CP negotiation fails, re-enable the interface by executing the shutdown command and then
the undo shutdown command to re-enable IPv6CP negotiation.