An L2TP dialup user can get online but cannot ping the LNS address

When L2TP connections between dialup software or non-Huawei LAC and the AR are established, several options (such as packet header compression) are not supported by the AR. The parameters involved in the negotiation do not affect the establishment of L2TP connections. Incorrect negotiations may cause incorrect packet encapsulation, leading to packet loss.
When the AR functions as the LNS, you are advised to enable LCP re-negotiation by running the mandatory-lcp command.
The mandatory-lcp command enables LCP renegotiation between the LNS and a remote user.

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