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Printer QR Code JIS X 0510 in C# Lesson 2

Lesson 2
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Designing VPN Connectivity
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7-15
Denso QR Bar Code Encoder In .NET
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EAP-MD5 can be used only with L2TP/IPSec VPNs and dial-up access, not with PPTP or wireless VPNs. It is less secure than EAP-TLS because it uses passwords, not certificates. It weakens password security as well. A reversibly encrypted password must be stored in the account database, as with CHAP. EAP/MS-CHAPv2 is password based and provides mutual authentication. The client must prove its knowledge of the user password to the server, and the server must prove its knowledge of the user password to the client. Encryp tion keys are generated for use with MPPE based on the user s password.
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Encryption Considerations
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Encryption protocols are selected when the VPN is configured. L2TP/IPSec VPNs will use IPSec for encryption. PPTP uses MPPE. Encryption strength is determined by the client and server configuration. Servers must be configured to provide an encryption strength the client is capable of. Encryption strength is rated by the size of the key used. In general, the larger the encryption key, the stronger the protection. Choices include the following:
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No encryption. This selection provides no protection for remote access connec tions of any kind and is not recommended. Basic. PPTP connections will use a 40-bit key. L2TP/IPSec connections will use 56-bit DES. Strong. PPTP connections will use a 56-bit key. L2TP/IPSec connections will use 56-bit DES. Strongest. PPTP connections will use a 128-bit key. L2TP/IP Sec connections will use 128-bit Triple DES (3DES).
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Remote Access Account Lockout Considerations
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This feature specifies how many times a remote access authentication attempt against a valid RAS client account can fail before the account is locked out. The remote access account lockout feature can be used to protect accounts against a dictionary or bruteforce password-cracking attack. In these types of attacks, hundreds of thousands of VPN connection attempts are sent across the network in an attempt to compromise a user account.
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If smart cards are used, lockout is controlled by the design of the smart card. The manufacturer determines how many times a user can enter an incorrect PIN before lockout. Smart-card lockout recovery might require replacement of the smart card.
7-16
7
Designing Secure Communications Between Networks
Setting remote access account lockout has no impact on the setting in the Group Policy Account lockout policy, nor does a setting in Group Policy affect the remote access account lockout feature. Instead, you must edit the registry to turn on the feature and edit the registry to unlock locked accounts. Before deciding to set account lockout, you should consider the following points:
Setting lockout to apply after a specified number of attempts will foil passwordcracking attacks but will also lock out legitimate users until the lockout is reset. A registry modification is required. The modification is made on the RAS server if Windows authentication is used. The modification is made on the IAS server if RADIUS authentication is used. The account lockout feature is not related to the Account Lockout Policy of Win dows computers. The Account Lockout Policy works only for LAN connections, while the account lockout feature works only with remote connection attempts.
Note The AccountLockout subkey is added to the registry when the Routing and Remote Access or Internet Authentication Service is installed on the Windows Server 2003 computer. The subkey is located at:
HKLM\SYSTEM\CurrentControlSet\Services\RemoteAccessParameter. To enable account lockout, set the MaxDenials value to the number of failed attempts that are allowed before lockout will occur. The number of failed attempts is reset according to the ResetTime value. Setting MaxDenials to zero disables remote account lockout. To change the time after which the number of recorded failed attempts is reset, enter the number of minutes in the ResetTime value. A registry subkey will be added for each user account that is locked out via remote access lockout. The subkey must be deleted to unlock the user account.
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