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IPv4 address is used when both computers can be directly addressed using IPv4, such as on a local area network or when both computers have public IP addresses. IPv6 address is used when both computers are on an IPv6 network; most routers and switches currently in use do not support IPv6 addressing. UPnP NAT address is used to connect through a UPnP router, which provides NAT traversal. NAT traversal via Teredo is used when all the other methods fail. After using a public Teredo server to determine NAT port mapping and to initiate communication, this connection then encapsulates IPv6 data in IPv4 packets, enabling it to tunnel through an IPv4 network.
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Connecting to Another PC with Windows Remote Assistance
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For more information about NAT, IPv4, IPv6, and Teredo, see 12, Setting Up a Small Network .
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Teredo can t make a connection
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If you can t make a connection and you re certain that a firewall isn t blocking the connection, be sure that UPnP is enabled on your router . (See the instructions for your router for details . If you no longer have the manual, check the manufacturer s website .) Teredo doesn t work with routers that use symmetric NAT . To find out if you have an incompatible router, at a command prompt type netsh interface teredo show state (this can be abbreviated as netsh int ter sho st) . If the Type line shows Symmetric or Port Restricted, your best bet is UPnP .
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With previous versions of Remote Assistance, connecting two systems behind NAT routers was difficult at best. Trying to explain to an inexperienced user who s already flustered because of computer problems all the complex configuration steps needed to bypass NAT made Remote Assistance impractical for most such setups. NAT is a great system for extending the limited number of available IP addresses and for securing computers on a small network. But it is the bane of users trying to make peer-to-peer connections, whether for voice, video, gaming or Remote Assistance. Now, the only obstacle to end-to-end connections for Remote Assistance on computers running Windows Vista is a firewall. Windows Firewall has an exception defined for Remote Assistance. (An exception is a group of rules that enable an application to communicate through the firewall.) By default, the exception is enabled only for private networks, such as a workgroup in a home or small office. The exception is disabled for public networks (such as an internet cafe or public Wi-Fi hotspot) and for domain networks. If you try to make a Remote Assistance connection when the exception is disabled, you ll see a message like the one shown in Figure 9-6.
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Figure 9-6 If you see this message, you need to enable the Remote Assistance exception in Windows Firewall.
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Obtaining Help and Support
To enable the exception in Windows Firewall, open Windows Firewall. In the left pane, click Allow A Program Through Windows Firewall (requires administrator privileges). On the Exceptions tab, select Remote Assistance and then click OK.
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Know the rules
The specific rules that make up the Remote Assistance exception vary depending upon the profile type . For example, UPnP connections are enabled only in the private and domain profiles not in the profile for public networks . Teredo connections are enabled only in the private and public profiles to prevent its use on corporate domains . The domain profile contains additional rules that enable help-desk personnel to offer assistance using DCOM . You might want to examine the rules that define the Remote Assistance exception, whether it s to satisfy your innate curiosity or to configure comparable rules for a third-party firewall . To do so:
1. Open Windows Firewall With Advanced Security (requires administrator privileges) . 2. In the console tree, select Inbound Rules or Outbound Rules . 3. In the Actions pane, click Filter By Group, Filter By Remote Assistance . 4. In the details pane, double-click a rule to review its specifics .
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