HP VPN Firewall Appliances Network Management Configuration Guide

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Displaying and maintaining PPP
Task Command Remarks
Display PPP user binding
information.
display ppp user bind [ virtual-template number ] [ |
{ begin | exclude | include } regular-expression ]
Available in any view.
Display information about a
VA interface or all the VA
interfaces on a VT interface.
display virtual-access [ va-number | dialer
dialer-number | peer peer-address | user user-name
| vt vt-number ] * [ | { begin | exclude | include }
regular-expression ]
Available in any view.
Display information about
an existing VT interface.
display interface virtual-template number [ brief ] [ |
{ begin | exclude | include } regular-expression ]
display interface [ virtual-template ] [ brief [ down ] ]
[ | { begin | exclude | include } regular-expression ]
Available in any view.
Clear statistics on a
specified interface.
reset counters interface [ virtual-template
[ interface-number ] ]
Available in user view.
PPP configuration examples
Typically, PPP works together with PPPoE and L2TP. For configuration examples, see "Configuring PPPoE"
and VPN Configuration Guide.
Troubleshooting PPP configuration
Symptom 1
PPP authentication always fails, preventing the link from going up.
Solution
This problem might 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 "Configuring PAP authentication" and "Configuring CHAP authentication" for
reference.
Symptom 2
Configure an IPv6 address on an interface where PPP encapsulation is enabled but IPv6 is disabled. The
PPP link fails IPv6CP negotiation and cannot go up. After enabled with IPv6, the interface still cannot go
up.
Analysis
IPv6CP negotiation cannot succeed when IPv6 is disabled. As IPv6CP does not support renegotiation,
IPv6CP negotiation cannot succeed even if you enable IPv6 subsequently.