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Chapter 5: Using The Router’s Web-based Utility
The Security Tab
Broadband Firewall Router with 4-Port Switch/VPN Endpoint
IP Address
. If you select IP Address, enter the IP Address of the VPN device at the other end of the tunnel.
The remote VPN device can be another VPN Router, a VPN Server, or a computer with VPN client software that
supports IPSec. The IP Address may either be static (permanent) or dynamic (changing), depending on the
settings of the remote VPN device. Make sure that you have entered the IP Address correctly, or the
connection cannot be made. Remember, this is NOT the IP Address of the local VPN Router, but the IP Address
of the remote VPN Router or device with which you wish to communicate.
FQDN
(Fully Qualified Domain Name). If you select FQDN, enter the FQDN of the VPN device at the other end of
the tunnel. The remote VPN device can be another VPN Router, a VPN Server, or a computer with VPN client
software that supports IPSec. The FQDN is the host name and domain name for a specific computer on the
Internet, for example, vpn.myvpnserver.com.
Any
. If you select Any for the Remote Security Gateway, the VPN device at the other end of the tunnel will
accept a request from any IP address. The remote VPN device can be another VPN Router, a VPN Server, or a
computer with VPN client software that supports IPSec. If the remote user has an unknown or dynamic IP
address (such as a professional on the road or a telecommuter using DHCP or PPPoE), then Any should be
selected.
Encryption
. Using Encryption also helps make your connection more secure. There are two different types of
encryption: DES or 3DES (3DES is recommended because it is more secure). You may choose either of these,
but it must be the same type of encryption that is being used by the VPN device at the other end of the tunnel.
Or, you may choose not to encrypt by selecting Disable.
Authentication
. Authentication acts as another level of security. There are two types of authentication: MD5
and SHA (SHA is recommended because it is more secure). As with encryption, either of these may be
selected, provided that the VPN device at the other end of the tunnel is using the same type of authentication.
Or, both ends of the tunnel may choose to Disable authentication.
Key Management
In order for any encryption to occur, the two ends of the tunnel must agree on the type of encryption and the way
the data will be decrypted. This is done by sharing a “key” to the encryption code. Under Key Management, you
may choose automatic or manual key management.
Automatic Key Management
. Select Auto (IKE) and enter a series of numbers or letters in the Pre-shared
Key field. Check the box next to PFS (Perfect Forward Secrecy) to ensure that the initial key exchange and IKE
proposals are secure. In the example shown the word
chappy
is used. Based on this word, which MUST be
entered at both ends of the tunnel if this method is used, a key is generated to scramble (encrypt) the data
being transmitted over the tunnel, where it is unscrambled (decrypted). You may use any combination of up
to 24 numbers or letters in this field. No special characters or spaces are allowed. In the Key Lifetime field,
Figure 5-22: Key Management
Figure 5-21: Remote Security Gateway
