Epygi Quadro4Li Administrator's Manual page 118

Quadro4Li Manual II: Administrator's Guide
The Manual Keying
components:
Depending on the selected encryption and authentication
services of the prior page (IPSec Connection Properties)
you will get some of the following text fields:
•
DES Encryption Key
•
3DES Encryption Key
•
SHA1 Authentication Key
•
MD5 Authentication Key
Manual keys must be entered in the hexadecimal format,
otherwise the error message "Incorrect Encryption Key"
will appear.
The SPIs (Security Parameter Index) are indices to keep
the IPSec Connection tunnels distinct. A security
association (SA) is defined by destination, protocol and
SPI. Without the SPI, connections to the same gateway
using the same protocol cannot be distinguished.
The public key is displayed in the RSA Public Key text
field so that the user may inform their IPSec connection
partner about it, for example, via fax.
The user has the option of generating 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 then 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.
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.
Quadro4Li; (SW Version 5.3.x)
page offers the following
Fig. II-197: IPSec Connection Wizard - Manual Keying Settings page
Fig. II-198: IPSec Connection Wizard - IPSec Connection RSA Key Settings page
Administrator's Menus
117