Bedienungsanleitung Linksys wireless g adsl gateway wag54g (Seite 37 von 99) (Englisch)

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Chapter 5: Configuring the Gateway

The Security Tab

Wireless-G ADSL Gateway

correctly, or the connection cannot be made. Remember, this is NOT the IP Address of the local VPN Gateway,

but the IP Address of the remote VPN Gateway or device with which you wish to communicate. If you enter an

IP address, only the specific IP Address will be able to acess the tunnel. If you select Any, any IP Address can

access the tunnel.

• 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. In Figure 5-19, DES (which is the default) has been

selected.

• 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, if 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. In the Manual Key Management screen, MD5 (the

default) has been selected.

• Key Management. Select Auto (IKE) or Manual from the drop-down menu. The two methods are described

below.

Auto (IKE)

Select Auto (IKE) and enter a series of numbers or letters in the Pre-shared Key field. 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 select to have the key expire at the end of a time period. Enter the number of

seconds you’d like the key to be useful, or leave it blank for the key to last indefinitely. Check the box next to

PFS (Perfect Forward Secrecy) to ensure that the initial key exchange and IKE proposals are secure.

Manual

Select Manual, then select the Encryption Algorithm from the drop-down menu. Enter the Encryption Key in

the field (if you chose DES for your Encryption Algorithm, enter 16 hexadecimal characters, if you chose 3DES,

enter 48 hexadecimal characters). Select the Authentication Algorithm from the drop-down menu. Enter the

Authentication Key in the field (if you chose MD5 for your Authentication Algorithm, enter 32 hexadecimal

characters, if you chose SHA1, enter 40 hexadecimal characters). Enter the Inbound and Outbound SPIs in the

respective fields.

• Status. The status of the connection is shown.

Click the Connect button to connect your VPN tunnel. Click View Logs to view system, UPnP, VPN, firewall,

access, or all logs.Click the Advanced Settings button and the Advanced IPSec VPN Tunnel Setup screen will

appear.

Figure 5-24: Manual Key Management

Figure 5-25: System Log

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