PPTP VPN service is unavailable after NAT is configured on an AR

No matter whether the PPTP server is on the public or private network, a NAT-enabled AR cannot translate the Data field that contains IP addresses or port numbers. To resolve this problem, enable the NAT ALG function.
For example, enable the NAT ALG function for PPTP as follows:
<Huawei> system-view  
[Huawei] nat alg pptp enable
NAT supported by PPTP is used in either of the following scenarios: PPTP client on the private network or PPTP server on the private network.
When the PPTP client is on the private network and the PPTP server is on the public network, the Client-Call-ID field is translated.
When the PPTP server is on the private network and the PPTP client is on the public network, the Server-Call-ID field is translated.

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