Users Manual Part 2

Device Configuration
VPN – PPTP Server
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BEC 4700A / 4700AZ User Manual
PPTP Server
The Point-to-Point Tunneling Protocol (PPTP) is a Layer2 tunneling protocol for implementing
virtual private networks through IP network.
In the Microsoft implementation, the tunneled PPP traffic can be authenticated with PAP, CHAP, and
Microsoft CHAP V1/V2 . The PPP payload is encrypted using Microsoft Point-to-Point Encryption
(MPPE) when using MSCHAPv1/v2.
NOTE: 4 sessions for Client and 4 sessions for Server respectively.
PPTP Server: Select Activate / Deactivate to enable or disable the PPTP Server.
Authentication Type: Pick an authentication type from the drop-down list. 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: Auto, data encryption and key length, with 40-bit or 128-bit, is automatically
negotiated when establish a connection. 128-bit keys provide strong stronger encryption than 40-bit
keys.
Encryption Mode: The encryption key will be changed every 256 packets with Stateful mode. With
Stateless mode, the key will be changed in each packet.
CCP (Compression Control Protocol): Enable to compress data to save bandwidth and increase
data transfer speed.