Installation guide

Quadro Manual II: Administrator's Guide Administrator's Menus
Quadro4x, 4xi, 4xa, 4xia, 4xs, 4xis, Quadro16x, 16xi, 16xa, 16xia, 16xs, 16xis; (SW Version 3.1.x) 85
The public key is displayed in the RSA Public Key text field
so the user may inform their IPSec connection partner
about it, for example, via fax.
Furthermore, the user has a possibility to generate a new
pair of keys by specifying the key length with the
corresponding radio buttons Generate a new 1024bit RSA
Key and Generate a new 2048bit RSA Key and the
clicking the Generate Button.
A valid RSA key should fit to following requirements:
• RSA key doesn't start with "0s"
• RSA key doesn't end with "=="
• RSA key contains symbols other than Alphanum,
+, /, =
The Email this to the peer text field requires the mailing
address of the IPSec connection partner. The Send button
will insert Quadro’s public RSA key into an e-mail and send
it to the IPSec connection partner.
Fig. II-134: IPSec Connection Wizard - IPSec Connection RSA Key Settings page
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. Thus 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, hence
active. The server is waiting for clients; it is not able to initiate the connection itself, hence passive.
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 Client Configuration link displays a page where all
existing PPTP client connections are listed, characterized by
their Connection Name, the State of the PPTP connection
(Pending, Disabled, Trying…, Authentication Failure, No
Connectivity - still trying, Unknown, Broken, or Connected) and
the Remote IP/Hostname (the IP address or the hostname of
the PPTP server). PPTP Connections’ states, except the
“Disabled” state, are established as a link that refers to the page
where logout information about PPTP connection status is
displayed. Logs can be useful to determine problems on PPTP
connections failure.
Start initiates the PPTP client(s) activity (reaching the server).
Several client connections may be selected at once.
The Stop button is used to stop the selected PPTP client(s)
activity. Several client connections may be selected at once
using this function.
Fig. II-135: PPTP Client Configuration page