厦 门 才 茂 通 信 科 技 有 限 公 司
Xiamen Caimore Communication Technology Co.,Ltd
18
4.3 VPN
4.3.1 GRE
Name
：
it is limited to use characters 0-9.a-z.A-Z
，
also can’t repeat name.
Remote IP
：
Remote public network IP
Remote Subnet
：
format is 192.168.1.0/24.
Interface IP address
：
The appointed virouteral interface IP address.
Local WAN IP
：
IP address used to create tunnel, if it is blank, it means to use WAN
IP address.
MTU
：
the max data packets which can go through tunnel.
4.3.2 PPTP
PPTP is a protocol in layer 2, it transfers data by encapsulating PPP data frames within
IP packets. It also can be used in the connection of private LAN. It uses a TCP connection
to maintain the tunnel, and uses GRE technology to encapsulate the data to PPP data frames
then transfer the data through tunnel. And also, it can encrypt or compress the data
encapsulated in PPP frames.
