Waveshare WS-431E, Руководство пользователя

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WS-431E
4G Router
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transmitted in another network layer protocol (such as IP). GRE adopts the technology of Tunnel,
which is the third layer tunnel protocol of VPN.
Note: These protocols can build VPN, and you can choose a more suitable protocol
according to your own needs.
4.7.1. PPTP CLIENT
Before application, you need to get the address, account, password and encryption method
of VPN server, then enable PPTP client, and write other parameters in turn.
Figure 62 Router adds VPN operation 1
< Description >

Server address: fill in the IP or domain name of the VPN server to be connected;