Reserved IP address: 207.68.200.76 Office intranet in Visual Studio .NET

Make QR Code JIS X 0510 in Visual Studio .NET Reserved IP address: 207.68.200.76 Office intranet

Reserved IP address: 207.68.200.76 Office intranet
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ISP 555-2323
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Network Connections MyISP connects to 555-2323 MyVPN connects to 207.68.200.76 User name: VpnUser Domain: DOMAIN1
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Configured Domain User Account| VpnUser
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Member of: DOMAIN1\Telecommuters
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Remote Access Policy| Name: Allow Telecommuters
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Conditions:
NAS-Port-Type matches Virtual (VPN)
Windows-Groups matches DOMAIN1\Telecommuters
Grant remote access permission
Figure 10-29
VPN configuration for remote access
Extranet/Router-To-Router VPN In an extranet scenario, two office networks connect by means of VPN servers running Routing And Remote Access. On each server, demand-dial interfaces both initiate and answer VPN connections. VPN connectivity depends on the authorization of these demand-dial interfaces, not on the authorization of individual users.
10-52
10
Configuring and Managing Remote Access
Note
Demand-dial interfaces do not necessarily describe dial-up connections. VPN interfaces in Routing And Remote Access are always considered a type of demand-dial interface, even when they initiate and respond to communication over a T1 line.
For each demand-dial VPN interface, you must configure a set of dial-out credentials including a user name, password, and domain; by default, the user name corresponds to the name of the demand-dial interface itself. However, this user name must also match the name of the demand-dial interface configured on the answering VPN server. To sim plify configuration, you can assign opposing demand-dial interfaces the same name. Figure 10-30 illustrates this scenario, in which both interfaces are given the name Buf_Syr, which is then used for dial-out credentials. Both VPN servers are members of a single domain named Domain1, and both subnets have local domain controllers. For connectivity to be authorized, a user account named Buf_Syr must already exist in the domain. Remote access policies must also authorize the connection. In this example, the policy grants permission to VPN-type connections originating from user accounts in a global group named VPN-Routers. Because the user account Buf_Syr is a member of this global group, router-to-router VPN connections are authorized by the policy at both locations. Finally, to allow full extranet connectivity, static routes must be deployed on each VPN server. The function of these static routes is to direct traffic destined for the opposite private network through the VPN demand-dial interface. These static routes are used for return traffic in addition to requests, so they must be configured on both servers even if all remote requests originate from the same network.
Lesson 3
Reserved IP address: 131.107.134.3 Reserved IP address: 207.68.200.76
Implementing VPNs 10-53
Buffalo office intranet
Syracuse office intranet
Internet
Domain1 Domain controller Demand-Dial Interface| Buf_Syr
connects to 207.68.200.76
VPN server
VPN server
Domain1
Domain controller
Demand-Dial Interface| Buf_Syr
connects to 131.107.134.3
Configured Domain User Account| Buf_Syr
Member of: DOMAIN1\VPN-Routers
Remote Access Policy| Name: Allow Extranet Connections
Conditions:
NAS-Port-Type matches Virtual (VPN)
Windows-Groups matches
DOMAIN1\VPN-Routers
Grant Remote Access Permission
Static Route| Destination: 192.168.10.0
Network mask: 255.255.255.0
Interface: Buf_Syr
Configured Domain User Account| Buf_Syr
Member of: DOMAIN1\VPN-Routers
Remote Access Policy| Name: Allow Extranet Connections
Conditions:
NAS-Port-Type matches Virtual (VPN)
Windows-Groups matches
DOMAIN1\VPN-Routers
Grant Remote Access Permission
Static Route| Destination: 192.168.20.0
Network mask: 255.255.255.0
Interface: Buf_Syr
Figure 10-30
Router-to-router VPN scenario
Deploying Routing Protocols over VPNs As an alternative to static routes, you can also deploy a routing protocol such as Routing Information Protocol (RIP) in an extranet scenario. To do so, first add the chosen routing protocol to the Routing And Remote Access console at each VPN server. Then add the VPN demand-dial interface to the protocol and configure as needed. For instance, in the case of RIP, you might choose to specify other VPN servers as RIP neighbors, to use peer filtering through password security, or to configure a much longer announcement interval than the default of 30
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10
Configuring and Managing Remote Access
seconds. If you are deploying your VPN over dial-up lines, be sure to configure the routers for autostatic updates. When deploying a routing protocol, verify that the protocol you choose is compatible with the other routers on your network. Finally, be sure to configure your network routers to accept updates from your VPN servers. Mixed VPN with Firewall Besides combining the remote access and extranet features described in the previous two scenarios, the network illustrated in Figure 10-31 adds a firewall to the network design. The VPN server, assigned a public address, is located behind this firewall in a perimeter network.
Packet Filters| Limit externally originating exchanges to: Requests to the VPN server Answers from the VPN server 192.168.20.0 Requests to the Web server Answers from the Web server Rochester main office intranet DMZ (public addresses) VPN server Firewall T1 line DSL line
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