Waveshare WS-431E User Manual page 60

WS-431E
4G Router
Interface: wan_4G, wan_wired and automatic can be selected according to different

networking modes;
User name/password: obtained from VPN server;
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Encryption method: MPPE encryption, no encryption, obtained from VPN server, and
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checked or unchecked according to the actual situation;
MTU: set the MTU value of the channel, which is 1450 by default. This setting should
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correspond to the VPN server;
NAT: This function is turned on by default. When the content needs to communicate with
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the outside, replace the internal address with the public address. If this item is disabled, the
network address translation function cannot be realized;
Peer subnet & mask: after filling in correctly, the subnet interworking function under VPN
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can be directly realized when NAT function is turned on;
Enable static tunnel IP address: it is not enabled by default, and the server automatically
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allocates IP. You can fill in the static tunnel IP here;
Extra opption: append the PPPD parameters, magic words, etc. No operation is required by

default;
Enable ping: a real-time VPN online detection and reconnection mechanism. Ping custom IP
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to ensure stable connection. Disabled by default.
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