Vpn; Gre; Pptp - Caimore CM520-82 User Manual

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.
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