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The $Secure file contains two index attributes $SDH and $SII and a data-stream attribute named $SDS, as Figure 11-46 shows NTFS assigns every unique security descriptor on a volume an internal NTFS security ID (not to be confused with an SID, which uniquely identifies computers and user accounts) and hashes the security descriptor according to a simple hash algorithm A hash is a potentially nonunique shorthand representation of a descriptor Entries in the $SDH index map the security descriptor hashes to the security descriptor s storage location within the $SDS data attribute, and the $SII index entries map NTFS security IDs to the security descriptor s location in the $SDS data attribute When you apply a security descriptor to a file or directory, NTFS obtains a hash of the descriptor and looks through the $SDH index for a match.

After a Remote Assistance connection has been established and both computers have entered the Screen Sharing state, the User and Helper are able to perform the tasks listed in Table 22-1 .

Chat Save a log of session activity Configure bandwidth usage Pause (temporarily hide screen) Request shared control Give up shared control Disconnect

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Remote Assistance works by establishing a P2P connection between the User s computer and the Helper s computer . One challenge this poses is that it can be difficult to establish P2P connections if one or both of the computers involved are behind a gateway or router that uses NAT . NAT is an IP routing technology described by RFC 1631 that is used to translate IP addresses and TCP/UDP port numbers of packets being forwarded . NAT is typically used to map a set of private IP addresses to a single public IP address (or to multiple public addresses) . Home networks using a wireless or wired router also use NAT technology . To overcome this difficulty, Windows 7 and Windows Vista include built-in support for Teredo, an IPv6 transition technology described in RFC 4380 that provides address assignment and automatic tunneling for unicast IPv6 connectivity across the IPv4 Internet . The NAT traversal capability provided by Teredo in Windows 7 and Windows Vista allows Remote Assistance connectivity when one or both of the users involved in a Remote Assistance session are hidden behind a NAT . The Remote Assistance experience is transparent from the perspective of the users involved, regardless of whether or not NAT is being used on either user s network . For most small business and home user environments, Remote Assistance in Windows 7 and Windows Vista will seamlessly traverse a NAT-enabled router with no additional router configuration required . For information on enterprises that need to remotely support users who work from home, see the section titled Other Possible Remote Assistance Usage Scenarios later in this chapter .

Offering Remote assistance using DCOM is not usually a Teredo scenario because en-

Remote Assistance can connect across restricted NATs and cone NATs, which generally comprise the large majority of deployed NATs . Beginning with Windows 7, Remote Assistance can also connect across certain types of symmetric NATs, but only if the other computer is not behind a symmetric NAT as well . For more information on NAT traversal support in Windows 7, see 28, Deploying IPv6 . Remote Assistance will not connect in certain configurations . Specifically:

Remote Assistance will not work if the NAT-enabled router is configured to block the specific ports used by Remote Assistance . See the section titled Remote Assistance and Windows Firewall later in this chapter for more information . Remote Assistance will not work if the User s NAT-enabled router is configured to block all UDP traffic .

For more information on IPv6 support in Windows 7, including built-in client support for Teredo and other IPv6 transition technologies, see 28 .

To verify whether your NAT supports Remote Assistance, you can use the Internet Connectivity Evaluation Tool at http://www.microsoft.com/windows/using/tools/igd/default.mspx . If your NAT supports Universal Plug and Play (UPnP), then Remote Assistance should be able to get a global IPv4 address that allows anyone to connect to you . If your NAT supports Teredo/ IPv6 and you are running Windows 7 or Windows Vista, then an RA Helper that is running Windows 7 or Windows Vista and is Teredo-enabled should be able to connect to you .

The ports used by a Remote Assistance session depend on which version of Windows is running on the two computers involved in the session . Specifically:

Windows 7 to Windows 7, Windows 7 to Windows Vista, or Windows Vista to Windows Vista Dynamic ports allocated by the system in the range TCP/UDP 49152 65535 Windows 7 to Windows XP or Windows Vista to Windows XP (local/remote) Port 3389 TCP

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