29
Chapter 5: Configuring the Wireless-G Travel Router with SpeedBooster
The Security Tab - VPN
Wireless-G Travel Router with SpeedBooster
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,
you may optionally select to have the key expire at the end of a time period of your choosing. Enter the
number of seconds you’d like the key to be useful, or leave it blank for the key to last indefinitely.
Manual Key Management
. Similarly, you may choose Manual keying, which allows you to generate the key
yourself. Enter your key into the Encryption KEY field. Then enter an Authentication KEY into that field. These
fields must both match the information that is being entered in the fields at the other end of the tunnel. Up to
24 alphanumeric characters are allowed to create the Encryption Key. Up to 20 alphanumeric characters are
allowed to create the Authentication Key.
The Inbound SPI and Outbound SPI fields are different, however. The Inbound SPI value set here must match
the Outbound SPI value at the other end of the tunnel. The Outbound SPI here must match the Inbound SPI
value at the other end of the tunnel. That is, the Inbound SPI and Outbound SPI values would be opposite on
the other end of the tunnel. Only numbers can be used in these fields. After you click the
Save Settings
