3Com 3CRWER300-73-US User Guide - Page 110

VPN, Note: Enabling L2TP over IPSec disables pass-through to IPSec and L2TP

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108 CHAPTER 5: CONFIGURING THE ROUTER VPN The Router has a Virtual Private Network (VPN) feature that provides a secure link between remote users and the corporate network by establishing an authenticated and encrypted tunnel for passing secure data over the Internet. The Router supports three modes of VPN operation: ■ IPSec (IP Security) - provides IP network-layer encryption. IPSec can support large encryption networks (such as the Internet) by using digital certificates for device authentication. When setting up an IPSec connection between two devices, make sure that they support the same encryption method. Note: Enabling IPSec VPN disables pass-through to IPSec and L2TP over IPSec Virtual Servers on the LAN. Pass-through outbound from clients on the LAN to servers on the Internet is unaffected. ■ PPTP (Point-to-Point Tunneling Protocol) - provides a secure tunnel for remote client access to a PPTP security gateway. It is not as secure as IPSec but is easy to administer. PPTP does not support gateway to gateway connections and is only suitable for connecting remote users. Check that your ISP's routers support this protocol before you use it. Note: Enabling the PPTP Server disables PPTP pass-through to a Virtual Server on the LAN. Pass-through outbound from clients on the LAN to servers on the Internet is unaffected. ■ L2TP over IPSec - this is a combination of two protocols. L2TP is used to authenticate a user, and IPSec is used to encrypt data. L2TP over IPSec does not support gateway to gateway connections and is only suitable for connecting remote users. Check that your ISP's routers support this protocol before you use it. Note: Enabling L2TP over IPSec disables pass-through to IPSec and L2TP over IPSec Virtual Servers on the LAN. Pass-through outbound from clients on the LAN to servers on the Internet is unaffected. Using the VPN Tunnel Configuration screen, you can add new IPSec, L2TP over IPSec and PPTP connections, and to edit existing connections. When adding or editing values on this screen remember that both ends of the connection must contain the same information.

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108
C
HAPTER
5: C
ONFIGURING
THE
R
OUTER
VPN
The Router has a Virtual Private Network (VPN) feature that provides a
secure link between remote users and the corporate network by
establishing an authenticated and encrypted tunnel for passing secure
data over the Internet. The Router supports three modes of VPN
operation:
■
IPSec (IP Security) — provides IP network-layer encryption. IPSec can
support large encryption networks (such as the Internet) by using
digital certificates for device authentication. When setting up an IPSec
connection between two devices, make sure that they support the
same encryption method.
Note: Enabling IPSec VPN disables pass-through to IPSec and L2TP over
IPSec Virtual Servers on the LAN. Pass-through outbound from clients on
the LAN to servers on the Internet is unaffected.
■
PPTP (Point-to-Point Tunneling Protocol) — provides a secure tunnel
for remote client access to a PPTP security gateway. It is not as secure
as IPSec but is easy to administer. PPTP does not support gateway to
gateway connections and is only suitable for connecting remote users.
Check that your ISP’s routers support this protocol before you use it.
Note: Enabling the PPTP Server disables PPTP pass-through to a Virtual
Server on the LAN. Pass-through outbound from clients on the LAN to
servers on the Internet is unaffected.
■
L2TP over IPSec — this is a combination of two protocols. L2TP is used
to authenticate a user, and IPSec is used to encrypt data. L2TP over
IPSec does not support gateway to gateway connections and is only
suitable for connecting remote users. Check that your ISP’s routers
support this protocol before you use it.
Note: Enabling L2TP over IPSec disables pass-through to IPSec and L2TP
over IPSec Virtual Servers on the LAN. Pass-through outbound from
clients on the LAN to servers on the Internet is unaffected.
Using the VPN Tunnel Configuration screen, you can add new IPSec, L2TP
over IPSec and PPTP connections, and to edit existing connections. When
adding or editing values on this screen remember that both ends of the
connection must contain the same information.