Vpn; Pptp - Billion BiPAC 7800(N) User Manual

VPN

A virtual private network (VPN) is a computer network that is constructed by using public networks
or wires such as Internet to provide remote offices or individual users to get secure access to their
organization's network. This network uses encryption and other security mechanisms to ensure
that only authorized users are able to participate in the communications and that the data cannot
be intercepted. It aims to avoid an expensive system of privately owned or leased lines that can be
used by only one organization.
The use of a public network, usually the Internet, to connect securely to a private network, is the
basis of a VPN. Companies and organizations will use a VPN to communicate confidentiality over a
public network; the VPN can be used to send voice, video or data. It is an excellent option for remote
workers and organizations with global offices and partners to share data in private manner.
You can find three items under the VPN section: PPTP, PPTP Account and PPTP Client.

PPTP

PPTP Funtion: Select Enable to activate PPTP Server. Disable to deactivate PPTP Server function
WAN Port: select ADSL means you establish a PPTP VPN base on ADSL port, when you use ADSL
for conneting to the internet, you then can this VPN.
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 Stateful or Stateless mode. The key will be changed every
256 packets when you select Stateful mode. If you select Stateless mode, the key will be changed
in each packet.
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