User manual

The Idle Timeout is the length of time with inactivity that passes before tunnel disconnection occurs.
4.4.3. L2TP/PPTP Server
This option allows VPN tunnels to be set up based on the L2TP protocol, where the DFL-160 acts as
a L2TP or PPTP server, receiving connection requests from external clients. Such clients are
sometimes called roaming clients since they might not have a fixed IP address and might connect
through temporary connection to a remote network.
Secure VPN connections by external clients could also be achieved, as described previously, using
IPsec tunnels. However, IPsec requires special IPsec client software be installed on the client
computer which can increase the overall complexity and expense of VPN. On many computers, such
as all Microsoft Windows PCs, L2TP and PPTP client software exists as a standard component
which means VPN is much simpler to implement.
The following sections appear in the web interface for setup:
A. General
B. IP Pool Settings
C. Authentication
D. MPPE
D. Idle Timeout
A. General
In this section of the page, the type of tunnel is selected (L2TP or PPTP) and if the tunnel uses IPsec
encryption (this is usually only the case for L2TP tunnels).
B. IP Pool Settings
The IP Pool is a range of IP numbers that can be handed out to clients as they connect to the
DFL-160 using this tunnel.
Relaying of DNS queries means that URL resolution requests are relayed to a DNS server. This will
require that the DFL-160 to have at least one DNS server defined.
C. Authentication
This section specifies how authentication is done with connecting clients.
D. MPPE
Microsoft Point to Point Encryption (MPPE) is an optional encryption method usually used only by
PPTP. The method chosen must be compatible with that used by connecting clients.
E. Idle Timeout
The Idle Timeout is the length of time with inactivity that passes before tunnel disconnection occurs.
4.4.3. L2TP/PPTP Server Chapter 4. The Firewall Menu
50