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* less than 0, or either account ID is invalid * @throws InsufficientBalanceException If the amount is greater than the current * balance of the "from" account */ void transfer(long accountIdFrom, long accountIdTo, BigDecimal amount) throws IllegalArgumentException, InsufficientBalanceException; /** * Transfers the specified amount from one account to another * @param accountFrom The account from which we'll withdraw * @param accountTo The account to which we'll deposit * @param amount The amount to be transferred * @throws IllegalArgumentException If the amount is not specified, the amount

A PPTP VPN client can be placed behind a Network Address Translation (NAT) server if the NAT server has a PPTP NAT editor (A NAT editor is a software addition that understands a specific protocol) Most NAT servers have a PPTP NAT editor L2TP/ IPSec clients cannot be placed behind a NAT server unless the VPN client and VPN server understand IPSec NAT Traversal (NAT-T) NAT-T is an IETF standard-track addi tion that describes how the IPSec protocol can be used with a NAT server Windows Server 2003, Microsoft L2TP/IPSec VPN client software, and the L2TP/IPSec NAT-T update for Windows XP and Windows 2000 support NAT-T To understand why the VPN client and server must understand NAT-T, you must exam ine the way that IPSec encrypts the packets and understand how NAT works.

To modify a user account, you make changes to the user account object in Active Directory. To complete the tasks for modifying user accounts successfully, you must have permission to administer the OU or container in which the user accounts reside. The procedures for renaming, disabling, enabling, and deleting user accounts are very similar.

7-45

Figure 7-5 showed the portion of the IPSec-protected packet that is encrypted which is just about everything Not encrypted is the IP address of the source and destination com puters When a NAT server receives a packet to forward to the Internet, it replaces the source IP address This does not cause a problem for most IP traffic because any responses will be directed to the NAT server and the NAT server can match the response with the original sending computer and forward it However, within the encrypted IPSec-protected packet are checksums that are calculated when the packet contained the original source IP address Because NAT cannot decrypt and then reencrypt the packet with a new checksum, the packet is interpreted by IPSec as being corrupt or modified This is why an unmodified Windows 2000 computer cannot support an L2TP/IPSec VPN when NAT is part of the equation.

* less than 0, or either account ID is invalid * @throws InsufficientBalanceException If the amount is greater than the current * balance of the "from" account */ void transfer(Account accountFrom, Account accountTo, BigDecimal amount) throws IllegalArgumentException, InsufficientBalanceException; }

To rename, disable, enable, and delete user accounts 1. Click Start, point to Administrative Tools, and then click Active Directory Users And Computers. 2. Expand the appropriate domain, and then click the appropriate OU. 3. In the details pane, select the user account that you want to rename, disable, enable, or delete. Click Action. 4. On the Action menu, click the command for the type of modification that you want to make, such as Rename, Disable Account, Enable Account, or Delete.

Windows Server 2003 solves that problem with NAT-T NAT-T uses UDP encapsulates of the IPSec packet and allows it to pass through NAT Internet Key Exchange (IKE) can detect whether NAT-T is present and uses UDP-ESP encapsulation Windows Server 2003 supports NAT-T The following Windows clients, as updated or configured, also support NAT-T You can use any of the following clients to create a VPN connection using L2TP/IPSec even if they are behind a NAT server as long as the VPN server is running Windows Server 2003:.

Note If a user account is enabled, the Action menu displays the Disable Account command. If a user account is disabled, the Action menu displays the Enable Account command.

If a user cannot log on to the domain or to a local computer, you night need to unlock the user s account or reset the user s password. It is not possible to lock a user s account if you need to ensure a user s account is not accessed, you must disable the account.

package org.jboss.ejb3.examples.ch17.transactions.api; import java.math.BigDecimal; import org.jboss.ejb3.examples.ch17.transactions.entity.User; /** * Contract of a service capable of simulating * a single game of blackjack. The actual gameplay is not modeled, * only the inputs and outputs of a single trial. * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> * @version $Revision: $