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FIgURE 25-11 IPv4 and IPv6 work side by side in Windows 7 .
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CHapTER 25 Configuring Windows Networking
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graphical user interface based configuration In Windows Vista and Windows 7, you can now configure IPv6 settings manually through a set of dialog boxes in the Network Connections folder (similar to the way you manually configure IPv4 settings) . In addition, you can configure both IPv4 and IPv6 using the Netsh command . Integrated IPsec support In Windows Vista and Windows 7, IPsec support for IPv6 traffic is the same as that for IPv4, including support for Internet Key Exchange (IKE) and data encryption . The Windows Firewall with Advanced Security and IP Security Policies snap-ins now support the configuration of IPsec policies for IPv6 traffic in the same way as for IPv4 traffic . For example, when you configure an IP filter as part of an IP filter list in the IP Security Policies snap-in, you can now specify IPv6 addresses and address prefixes when specifying a specific source or destination IP address . MlDv2 Multicast Listener Discovery version 2 (MLDv2), specified in RFC 3810, provides support for source-specific multicast traffic . MLDv2 is equivalent to Internet Group Management Protocol version 3 (IGMPv3) for IPv4 . llMNR Link-Local Multicast Name Resolution (LLMNR) allows IPv6 hosts on a single subnet without a DNS server to resolve each other s names . This capability is useful for single-subnet home networks and ad hoc wireless networks . IPv6 over PPP The built-in remote access client now supports IPv6 over the Pointto-Point Protocol (PPP) (PPPv6), as defined in RFC 2472 . Native IPv6 traffic can now be sent over PPP-based connections . For example, PPPv6 support allows you to connect with an IPv6-based ISP through dial-up or PPP over Ethernet (PPPoE) based connections that might be used for broadband Internet access . Random interface IDs for IPv6 addresses To prevent address scans of IPv6 addresses based on the known company IDs of network adapter manufacturers, Windows Vista, Windows 7, and Windows Server 2008 by default generate random interface IDs for non-temporary, autoconfigured IPv6 addresses, including public and link-local addresses . DHCPv6 support Windows Vista, Windows 7, and Windows Server 2008 include a DHCPv6-capable DHCP client that will perform stateful address autoconfiguration with a DHCPv6 server . Windows Server 2008 includes a DHCPv6-capable DHCP Server service .
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For more information about IPv6, see 28, Deploying IPv6 .
802.1X Network authentication
802 .1X is a protocol for authenticating computers to your network infrastructure before allowing them access . 802 .1X is commonly used to protect IEEE 802 .11 wireless networks . If a client computer cannot provide a set of valid credentials for a wireless network, the wireless access point will not allow the client to join the network . 802 .1X can also be used to protect wired networks . For example, if you physically connect a computer to an Ethernet network, the Ethernet switch can use 802 .1X to require the client
Core Networking Improvements
CHapTER 25
computer to authenticate to the network infrastructure . If the computer passes the authentication requirements, the network infrastructure will forward network traffic freely to and from the client computer . If the client computer does not provide valid credentials or otherwise cannot meet specified requirements, it can be denied access or placed onto a restricted network . Windows Vista and Windows 7 support 802 .1X authentication for both wired and wireless networks . Clients can authenticate themselves using a user name and password or a certificate, which can be stored locally on the computer or on a smart card . With compatible network hardware and a Remote Authentication Dial-in User Service (RADIUS) authentication server (such as a computer running Windows Server 2003 or Windows Server 2008), you can control both wired and wireless access to your intranet centrally . This means that an attacker with physical access to your facilities cannot simply plug a computer into an available Ethernet port and gain access to your intranet . When you combine 802 .1X authentication with Network Access Protection (NAP), you can ensure that computers have required security updates and meet other system health requirements before allowing them unlimited access to your intranet . Although almost all wireless access points support 802 .1X, only newer wired network switches support the authentication protocol . When a computer is connected to your network, the switch must detect this connection, initiate the authentication process with the connected computer, send an authentication request to the RADIUS server you have configured, and then use the server s response to determine whether the client computer should be connected to your private intranet, a restricted network, another virtual LAN (VLAN), or whether other restrictions should be applied . Figure 25-12 illustrates this process . In addition to restricting network access, 802 .1X can be used to apply user-specific bandwidth or QoS policies .
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