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Page 106 / 115 Scroll up to view Page 101 - 105
106
Phase 2 DH Group
Select DHx after enabling PFS.
Replay Detection
Select Enable to enable replay detection. As VPN setup is
processing intensive, the system is vulnerable to Denial of
Service (DOS) attacks. The IPSec receiver can detect and
reject old or duplicate packets to protect against replay attacks.
NetBIOS Broadcast
Forwarding
Select Enable to send NetBIOS (Network Basic Input/Output
System) packets through the VPN connection. NetBIOS
packets are TCP or UDP packets that enable a computer to find
other computers. It may sometimes be necessary to allow
NetBIOS packets to pass through VPN tunnels in order to allow
local computers to find computers on the remote network and
vice versa.
Dead Peer Detection
Select Enable to force the Cable Modem/Router to periodically
detect if the remote IPSec Cable Modem/Router is available or
not.
Manual Encryption
Key
If Manual mode is selected in the Key Management field, enter a
16 hexadecimal digits manual encryption key for encryption.
Manual
Authentication Key
Enter a 32 hexadecimal digit unique authentication key to be
used by IPSec.
Inbound SPI
Enter a unique SPI (Security Parameter Index) for inbound SPI.
Outbound SPI
Enter a unique SPI (Security Parameter Index) for outbound
SPI.
L2TP/PPTP
The L2TP/PPTP page allows you to configure server and security settings. The L2TP
(Layer 2 Tunneling Protocol) and PPTP (Point-to-Point Tunneling Protocol) both allow
PPP frames to be tunneled through the network. PPTP is a Microsoft proprietary
protocol, which is very similar to L2TP.
To access the
L2TP/PPTP
page:
1
Click
VPN
in the menu bar.
2
Then click the
L2TP/PPTP
submenu.
Figure 36 shows an example of the menu and Table 32 describes the items you can
select.
Page 107 / 115
107
Figure 36. Example of L2TP/PPTP Page
Page 108 / 115
108
Table 32. L2TP/PPTP Menu Option
Option
Description
PPP Address Range
(Start/End)
Configure the dedicated IP address pool for L2TP/PPTP. The
LAN IP subnet at one end of the VPN tunnel must be different
from the LAN
IP subnet at the other end of the VPN tunnel. For example, if
one side’s LAN subnet is 192.168.
0
.x, then the other side
should be 192.168.
1
.x (where the subnet mask in this
example is 255.255.255.0).
PPP Security (MPPE
Encryption)
Select Enable to enable MPPE (Microsoft Point-to-Point
Encryption). MPPE is used to enhance the confidentiality of
PPP-encapsulated packets. It uses the RSA RC4 encryption
algorithm.
Username
Enter the user name for the L2TP or PPTP tunneling.
Password
Enter the password for the L2TP or PPTP tunneling.
Confirm Password
Re-enter to confirm the password.
User List
Show the existing user list.
L2TP Server
(Preshared Phrase)
Enter a key (Pre-Shared key) for authentication. This key is
used by IPSec to validate the computer as a trusted machine.
Event Log
The Event Log page shows the VPN event log.
To access the
Event Log
page:
1
Click
VPN
in the menu bar.
2
Then click the
Event Log
submenu.
Figure 37 shows an example of the menu and Table 33 describes the items you can
select.
Page 109 / 115
109
Figure 37. Example of Event Log Page
Table 33. Event Log Menu Option
Option
Description
Time
Shows the local time mapping to a certain log event.
Description
Shows detailed information of a VPN event log.
Page 110 / 115
110
Appendix A: Troubleshooting Tips
Problem
I cannot access my Internet service or send or receive email.
Solution
The following front panel lights on the Cable Modem/Router –
ONLINE
,
US
(upstream),
DS
(downstream), and
POWER –
must be solidly lit before your modem will let you
connect to the Internet. If they are not:
Check all modem connections (power, Ethernet, and cable modem line).
Unplug your Cable Modem/Router and then plug it back in.
Restart your computer.
Check to see that your cable TV is working.
If you have any splitters between the cable modem and the wall, remove the splitter
and connect the cable modem directly to the wall.
A splitter is a small device that
has a single coax cable on one side and 2 coax cables on the other side.
Check with your cable service provider to make sure that high speed access is
available and running.
In rare instances, the cable signal may be weak or noisy. If this is the case, call your
cable service provider.
If you are using your PC’s Ethernet port, check that this port is functioning correctly.
If you are using wireless, check that your wireless connection is functioning
correctly. Refer to its documentation if necessary.
Check that your Web browser is configured correctly. It should be set to use a
network connection; this might be called a LAN (Local Area Network) or broadband
connection.
Check that your computer’s network settings are configured correctly. A Windows
computer should have a local area connection that should normally be Internet
Protocol version 4, Internet Protocol version 6, or TCP/IP; not AOL, Dial-up, or
Adapter. A Macintosh computer should be configured for Built-in Ethernet, and
TCP/IP should be set to Using DHCP.
You may need to register your modem’s MAC address with your cable provider.
When your provider asks for your MAC address tell them the
CM MAC
address on
your Cable Modem/Router’s bottom label.
Problem
I cannot access my Internet service or send or receive email and my
ONLINE
,
US
(upstream),
DS
(downstream), and
POWER
lights are correct on the front panel

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