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PPTP
The Point-to-Point Tunneling Protocol (PPTP) is a Layer2 tunneling protocol for implementing
virtual private networks through IP network. PPTP uses an enhanced GRE (Generic Routing
Encapsulation) mechanism to provide a flow- and congestion-controlled encapsulated datagram
service for carrying PPP packets.
In the Microsoft implementation, the tunneled PPP traffic can be authenticated with PAP, CHAP,
Microsoft CHAP V1/V2 or EAP-TLS. The PPP payload is encrypted using Microsoft Point-to-Point
Encryption (MPPE) when using MSCHAPv1/v2 or EAP-TLS.
Note:
4 sessions for Client and 4 sessions for Server respectively.
PPTP Server
In PPTP session, users can set the basaic parameters(authentication, encyption, peer address, etc)
for PPTP Server, and accounts in the next page of PPTP Account. They both constitutes the PPTP
Server setting.
PPTP Funtion: Select Enable to activate PPTP Server. Disable to deactivate PPTP Server function.
WAN Interface: Select the exact WAN interface configured for the tunnel. Select Default to use the
now-working WAN interface for the tunnel.
Auth. Type: The authentication type, Pap or Chap, PaP, Chap and MS-CHAPv2. When using PAP,
the password is sent unencrypted, whilst CHAP encrypts the password before sending, and also
allows for challenges at different periods to ensure that an intruder has not replaced the client. When
passed the authentication with MS-CHAPv2, the MPPE encryption is supported.
Encryption Key Length: The data can be encrypted by MPPE algorithm with 40 bits or 128 bits.
Default is Auto, it is negotiated when establishing a connection. 128 bit keys provide stronger
encryption than 40 bit keys.
Peer Encryption Mode: You may select "Only Stateless" or "Allow Stateless and Stateful" mode.
The key will be changed every packet when you select Stateless mode.
IP Addresses Assigned to Peer: 192.168.1.x: please input the IP assigned range from 1~ 254.
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