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Configuring IP Addressing and Name Resolution
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Resolver queries to DNS servers Query 1 Query 2 Query 3 Query 4 Query 5
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To specify a preferred and alternate DNS server 1. In Control Panel, select Network and Internet Connections. 2. In the Network and Internet Connections sheet, select Network Connections. 3. In Network Connections, right-click the local area network connection that you want to change and then click Properties. 4. Select Internet Protocol (TCP/IP), and then click Properties. 5. On the General tab of the TCP/IP Properties sheet, select the method to be used to access the DNS servers for your network:
If a DHCP server is available for automatic IP addressing and is configured to provide parameters for automatic DNS server configuration, select Obtain DNS server address automatically. If the IP addresses for the DNS servers are to be manually configured, select Use the following DNS server addresses option button. Type the IP addresses of the preferred and alternate DNS servers in the appropriate boxes.
To specify additional alternate DNS servers 1. In Control Panel, select Network and Internet Connections. 2. In the Network and Internet Connections sheet, select Network Connections.
Part IV:
Networking
3. On the General tab of the Network Connections Properties sheet, click Advanced. 4. Click the DNS tab. 5. Under DNS server addresses, in order of use, click Add. 6. Type the IP address of the DNS server that you want to add. 7. Click Add. To remove an IP address from the list, select it and then click Remove. The order of the IP addresses, and thus the search order, can be rearranged as needed to reflect changes in name server availability or performance, or to implement load balancing. To set the DNS server search order 1. In Control Panel, select Network and Internet Connections. 2. In the Network and Internet Connections sheet, select Network Connections. 3. Right-click Local Area Connections, and click Properties. 4. On the General tab, in the Local Area Connection Properties dialog box, select Internet Protocol (TCP/IP), and click Properties. 5. On the General tab, in the Internet Protocol (TCP/IP) dialog box, click Advanced. 6. In the Advanced TCP/IP Settings dialog box, click the DNS tab. 7. In the DNS server addresses, in order of use box, select the IP address of the DNS server that you want to reposition. 8. Click the up-arrow or down-arrow button to reposition the selected IP address within the list of DNS servers, and click OK.
DNS Caching, Network Prioritization, and Security
The default settings of DNS might need to be changed to optimize the performance and security of the Windows XP Professional DNS client. You can make configuration changes to:
Configure caching and negative caching Configure Subnet prioritization Prevent the resolver from receiving responses from nonqueried servers
Configuring caching and negative caching When the Windows XP Professional resolver receives a positive or negative response to a query, it adds that positive or negative response to its cache, thus creating a DNS resource record. The resolver always checks the cache before querying any DNS server, so if a DNS resource record is in the cache, the resolver uses the record from the cache rather than querying a server. This expedites queries and decreases network traffic for DNS queries.
24:
Configuring IP Addressing and Name Resolution
You can use the Ipconfig tool to view and to flush the DNS resolver cache. To view the DNS resolver cache
At the command prompt, type: ipconfig /displaydns
Ipconfig displays the contents of the DNS resolver cache, including the DNS resource records preloaded from the Hosts file as well as any recently queried names that were resolved by the system. After a certain amount of time, specified in the Time to Live (TTL) associated with the DNS resource record, the resolver discards the record from the cache. You can also flush the cache manually. After you flush the cache, the computer must query DNS servers again for any DNS resource records previously resolved by the computer. To flush the cache manually by using Ipconfig
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