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http://www.cohovineyard.com IP Address 172.16.10.1
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Perimeter Network IP Address 131.107.1.1
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A split DNS uses two different DNS servers with the same DNS domain name to provide name resolution for internally and externally accessible resources. Both DNS servers are authoritative for the same domain name. For example, in the Web publishing scenario shown in Figure 8-1, one DNS server, used by all the internal clients, has a host record for the Web server that points to the actual IP address of the Web server. The second DNS server, accessible to Internet clients, has a host record for the Web server that points to the IP address of the external interface of the server running ISA Server.
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Security Alert To implement a split DNS, you need two DNS servers, both of which are authoritative for the same domain. However, these two servers should not have the same resource records. For example, your internal DNS server will have the IP addresses for all the internal servers (including the domain controllers if you have deployed Active Directory directory service). This information should never be made available on the Internet DNS server. The Internet DNS server should only have resource records for the hosts that must be accessible from the Internet. If you are exposing a single Web site and a single messaging server to the Internet, then the Internet DNS server should have only the resource records required to resolve the IP addresses for those two servers.
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8
Implementing ISA Server Publishing
With a split DNS, users from both the Internet and the internal network can access the corporate Web site, as illustrated in Figure 8-2.
SOA cohovineyards.com www.cohovineyards.com A 131.107.1.1 http://www.cohovineyard.com IP Address 172.16.10.1 Web Server
Internal Client
Perimeter Network
Internet DNS Server IP Address 131.107.1.1
Internal Network ISA Server
Internet
Internet Client
Internal DNS Server
F08im02
SOA cohovineyards.com www.cohovineyards.com A 172.16.10.1
Figure 8-2 Implementing a split DNS
When the Internet client wants to access the Web server, it must resolve the name www.cohovineyard.com. The client sends a query to the DNS server on the Internet. Because the DNS server has a Start of Authority (SOA) record for the cohovineyard.com domain, the DNS server checks its zone files for the requested information. The server responds with the IP address of the external interface of the server running ISA Server. The client will then send the Web request to the IP address provided by the DNS server, and ISA Server will forward the request to the Web server.
The scenario described here assumes a Network Address Translation (NAT) relationship between the external network and the perimeter network and a route relationship between the internal network and the perimeter network. If the network relationships were reversed, then the host record on the external DNS would point to the actual IP address for the Web server, while the host record on the internal DNS would point to the IP address of the internal network interface on ISA Server.
Note
Lesson 1
Introduction to Publishing
When the internal client wants to access the Web server, it will query the internal DNS server for the IP address of www.cohovineyard.com. The internal DNS server will check its zone files, and provide the client with the actual IP address of the Web server. The internal client will then directly connect to the internal Web server. If the Web server is located on a perimeter network, the request will be passed through ISA Server.
Important Firewall clients and Web proxy clients do not require a split DNS configuration to access the internal Web sites as they can use the Internet IP address to access the internal server. In this configuration, the Web requests are passed through ISA Server. However, Secure Network Address Translation (SecureNAT) clients cannot connect to the internal Web servers using an Internet IP address as SecureNAT client requests cannot be routed back through the ISA Server computer. Even if you do not need to implement a split DNS, it is still a best practice to implement a split DNS, especially if you publish Web servers on the internal network. In this way, Web Proxy and Firewall clients can access the internal Web servers directly rather than through the ISA Server computer.
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