Quadro Quadro16xi Installation Guide download pdf (Page 122)

Quadro Manual II: Administrator's Guide Administrator’s Menus

Quadro2x, 2xi, Quadro4x, 4xi, Quadro16x, 16xi; (SW Version 5.2.x) 121

PPTP (Point-to-Point Tunneling Protocol) is used to establish a virtual private network (VPN) over the Internet. Remote users can access their

corporate networks via any ISP that supports PPTP on its servers. PPTP encapsulates any type of network protocol (IP, IPX, etc.) and transports it

over IP. Therefore, if IP is the original protocol, IP packets ride as encrypted messages inside PPTP packets running over IP. PPTP is based on

point-to-point protocol (PPP) and the Generic Routing Encapsulation (GRE) protocol. Encryption is performed by Microsoft's Point-to-Point

Encryption (MPPE), which is based on RC4.

L2TP (Layer 2 Tunneling Protocol) is a protocol from the IETF, which allows a PPP session to run over the Internet, an ATM, or frame relay network.

L2TP does not include encryption (as does PPTP), but defaults to using IPSec in order to provide virtual private network (VPN) connections from

remote users to the corporate LAN. Derived from Microsoft's Point-to-Point Tunneling Protocol (PPTP) and Cisco's Layer 2 Forwarding (L2F)

technology, L2TP encapsulates PPP frames into IP packets either at the remote user's PC or at an ISP that has an L2TP remote access

concentrator (LAC). The LAC transmits the L2TP packets over the network to the L2TP network server (LNS) at the corporate side. Large carriers

also may use L2TP to offer remote POPs to smaller ISPs. Users at the remote locations dial into the modem pool of an L2TP access concentrator,

which forwards the L2TP traffic over the Internet or private network to the L2TP servers at the ISP side, which then sends them on to the Internet.

For PPTP and L2TP Connections, two parties are required: a Client and a Server. The client is responsible for establishing the connection. The

server is waiting for clients, it is not able to initiate the connection itself.

Attention: L2TP tunnels have no data encryption mechanism.

The Host Name and a Password specify each side. The client should know the server’s name and password (the Quadro server has no password)

and the server should set the client’s host name and a password. The client and server settings have to match on both sides for successful

connection establishment.

Clients and Servers are identified by their hostnames, which means that only one client can be connected to the server in the same network. Servers

also define the range of IP addresses that are assigned to the Server and Client hosts participating in a connection.

The PPTP/L2TP Configuration link displays a page where a new PPTP and L2TP connection can be configured, as well as PPTP and L2TP server

settings can be adjusted. The page consists of 3 sub-pages.

The Connections page lists all existing connections are listed,

characterized by their Connection Name, Type of the

connection (PPTP or L2TP), the Client/Server mode, the State

of the connection and the Remote Hostname IP (the IP

address or the hostname of the connection peer). The state of

the PPTP and L2TP Connections, except for the “Stopped”

state, is established as a link that refers to the page where

logout information about the connection status is displayed.

Logs can be useful to determine problems on PPTP or L2TP

connections failure.

Add functional button leads to the PPTP/L2TP Connection

Wizard page, where a new connection can be established.

Please Note: After creating a PPTP server connection, PPTP

connections between devices placed on the Quadro LAN

and external devices will no longer be possible. The PPTP pass-

through service for incoming and outgoing traffic will be

automatically disallowed once a PPTP server connection is

created.

Fig. II-204: PPTP/L2TP Configuration page

The PPTP/L2TP Connection Wizard consists of several pages

and allows you to create a new PPTP or L2TP connection.

The PPTP/L2TP Connection Wizard – Page 1 consists of the

following components:

Connection Name text field requires a connection identification

name. The name of the connection cannot start with a digit

symbol, however it can contain digits further in the name.

Connection Type drop down list allows to select the type of the

connection (PPTP or L2TP).

Fig. II-205: PPTP/L2TP Connection Wizard – Page 1

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Quadro Quadro16xi Installation Guide Page 122

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