zxing qr code writer example c# CONFIGURING aUTHENTICaTION FOR IKEV2 CONNECTIONS in Visual C#

Encoder QR Code in Visual C# CONFIGURING aUTHENTICaTION FOR IKEV2 CONNECTIONS

CONFIGURING aUTHENTICaTION FOR IKEV2 CONNECTIONS
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When you force a connection to use IKEv2 as its tunnel type, you have a choice of two authentication methods from which to select for authenticating the client to the server (see Figure 27-6):
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Use EAP to authenticate the remote user to the VPN server . Use a machine certificate installed on the client computer to authenticate the client computer to the VPN server .
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The default setting here is to use EAP, which doesn t require a machine certificate to be installed on the client computer . For IKEv2 to work, however, a machine certificate must be installed on the VPN server so that the server s identity can be authenticated by the client .
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FIgURE 27-6 Forcing IKEv2 as the tunnel type provides two authentication methods from which to choose .
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Note that if you select the Use Machine Certificates option on your client computers running Windows 7, you must also configure your VPN server running Windows Server 2008 R2 to support this configuration . To do this, follow these steps on the server:
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Open the Properties dialog box of the VPN server in the RRAS console . Select the Security tab and click Authentication Methods . Select the check box labeled Allow Machine Certificate Authentication Using IKEv2 .
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Configuring VPN Connections CHapTER 27 1333
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CONFIGURING MOBILITY FOR IKEV2 CONNECTIONS
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When you force a connection to use IKEv2 as its tunnel type, you also have a choice of enabling or disabling mobility (VPN Reconnect) for the VPN connection . To enable mobility for the connection, click Advanced Settings and make sure the check box is selected (see Figure 27-7) . To disable mobility for the connection, clear the check box . The default setting for an IKEv2 connection is for mobility to be enabled . You can also use this dialog box to configure the maximum allowed network outage time for the VPN connection, which can range from 5 minutes to 8 hours (the default is 30 minutes) . If the underlying Layer 2 network connectivity is interrupted and not restored within the configured network outage time, the VPN connection will be terminated (that is, mobility will fail) .
FIgURE 27-7 Configure mobility for IKEv2 VPN connections .
Additional mobility settings for IKEv2 VPN connections can be configured on the server side . To see these settings, begin by opening Routing And Remote Access from Administrative Tools on a VPN server running Windows Server 2008 R2 . Then right-click the VPN server node and select Properties, select the IKEv2 tab, and configure the settings on this tab as shown in Table 27-4 .
TABlE 27-4 Server-Side Settings for Configuring IKEv2 Mobility
SETTINg
EXPlANATION
DEFAUlT
Idle Time-out (Minutes) Network Outage Time (Minutes)
The time (in minutes) that an IKEv2 client connection can be idle before it is terminated .
5 minutes
The time (in minutes) that IKEv2 packets are 30 minutes retransmitted without a response before the connection is considered lost . Higher values support connection persistence through network outages .
CHapTER 27
Connecting Remote Users and Networks
SETTINg
EXPlANATION
DEFAUlT
SA Expiration Time (Minutes)
The time (in minutes) after which an IKEv2 client SA 480 minutes expires . An SA expires either at the expiration time or when the SA data size limit is reached, whichever occurs first; a new quick mode negotiation must succeed before the two computers can continue to exchange data . The amount of network traffic (in megabytes) that can be sent through an IKEv2 SA before the SA expires; a new quick mode negotiation must succeed before the two computers can continue to exchange data . 100 MB
SA Data Size Limit (MB)
In Windows 7 and Windows Server 2008 R2, you can also configure IKEv2 settings (including mobility settings) from the command line by using the Netsh command . The following examples show some of the netsh ras set commands that are available for configuring IKEv2 mobility . netsh ras set ikev2connection [[idletimeout=] <idle_timeout>] [[nwoutagetime=] <nw_outage_time>] This command sets the idle time-out and network outage time values for IKEv2 client connections by using the following parameters:
idletimeout Specifies the idle time-out in minutes for IKEv2 client connections . This value is used to disconnect IKEv2 connections in case the client machine is idle . nwoutagetime connections . Specifies the network outage time value in minutes for IKEv2 client
netsh ras set ikev2saexpiry [[saexpirytime=] <sa_expiry_time>] [[sadatasizelimit=] <sa_datasize_limit>] This command sets the IKEv2 SA expiration controls by using the following parameters:
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