dns suffix

DNS SuffixS4T4N in

DNS SERVERWhat is DNS Server?

The Domain Name System (DNS) is a distributed Database system that can serve as the foundation for name resolution in a TCP / IP Network .

CONFIGURING HOSTSWhat is The Resolver?

Resolvers are the clients that access nameservers. Programs running on a host that need information from the domain namespace use the resolver (Client Computer)

CONFIGURING CLIENTS SETTINGS

1. Set a DNS computer or host name for each computer. For example, in the FQDN BEHZAD.CyberTech.Mehrpouyan.com., the DNS computer name is the leftmost label, client1.


2. Set a primary DNS suffix* for the computer. This suffix, when added to the host name, forms the full computer name. In the previous example, the primary DNS suffix is CYBERTECH.MEHRPOUYAN.COM.

* : "DNS suffixes" are used for resolving unqualified domain names (names with no dots).


3. Set a list of DNS servers for the client to use when resolving DNS names. This list includes a preferred DNS server and can also include alternate DNS servers to use if the preferred server is unavailable.

SETTING COMPUTER NAME

Computer Name Restrictions :the name you assign must not exceed 63 bytes, and it can only include the followingcharacters:■ Uppercase letters, A through Z■ Lowercase letters, a through z■ Numbers, 0 through 9■ Hyphens (-)■ DNS names are not case-sensitive


Now Its Our Practice1. Set Host Name (Computer Name)

2. Set Primary DNS Suffix in Windows 2000

3. Set Primary DNS Suffix in Windows XP / 2003

4. Set Primary DNS Suffix in Windows VISTA / 2008 / 7


1. Set Host Name (Computer Name)


2. Set Primary DNS Suffix in Windows 2000


3. Set Primary DNS Suffix in Windows XP / 2003


4. Set Primary DNS Suffix in Windows VISTA / 2008 / 7

CONFIGURING CLIENT SETTINGS (OPTIONAL)

1. Set the DNS suffix search list or search method to be used by the client when itperforms DNS query searches for short, unqualified domain names.


2. Set a connection-specific DNS suffix for each particular adapter on a DNS clientcomputer. For example, if the host named Behzad.CyberTech.com is connectedto two subnets through different network adapters, the computer can be seen on one subnet as Behzad.Subnet1.Mehrpouyan.com and on another asBehzad.subnet2.Mehrpouyan.com.


3. Modify dynamic DNS update behavior.


What is connection-specific DNS suffix ?


1. The name hosta.public.example.microsoft.com provides access using LAN connection 1 over Subnet 1, a lower speed (10-Mb) Ethernet LAN, for normal access to users who have typical file and print service needs.2. The name host-a.backup.example.microsoft.com provides access using LAN connection 2 over Subnet 2, a higher speed (100-Mb) Ethernet LAN, for reserved access by server applications and administrators who have special needs, such as troubleshooting server networking problems, performing network-based backup, or replicating zone data between servers.3. The computer can also be accessed in a manner that does not specify a particular LAN connection. To connect to the computer through either LAN connection, clients specify the computer’s full computer name, host-a.example.microsoft.com.


Now its Our Practice

1. Configure DNS Suffixes on Windows 95 / 98 / ME

2. Configure DNS Suffixes on Windows NT4

3. Configure DNS Suffixes on Windows 2000 / XP / 2003

4. Configure DNS Suffixes on Windows Vista / 2008 / 7


1. Configure DNS Suffixes on Windows 95 / 98 / ME

CONFIGURING CLIENT SETTINGS (OPTIONAL)2. Configure DNS Suffixes on Windows

NT4


3. Configure DNS Suffixes on Windows 2000 / XP / 2003


4. Configure DNS Suffixes on Windows Vista / 2008 / 7


Specifying DNS servers


When resolving names, the DNS Client service queries the DNS servers in the followingorder:1. The DNS Client service sends the query to the first server on the preferred adapter’s list of DNS servers and waits 1 second for a response.2. If the DNS Client service does not receive a response from the first server within 1 second, it sends the query to the first DNS servers on all adapters that are still under consideration and waits 2 seconds for a response.3. If the DNS Client service does not receive a response from any server within 2 seconds, the resolver sends the query to all DNS servers on all adapters that are still under consideration and waits another 2 seconds for a response.4. If the DNS Client service still does not receive a response from any server, it sends the query to all DNS servers on all adapters that are still under consideration and waits 4 seconds for a response.5. If it still does not receive a response from any server, the resolver sends the query to all DNS servers on all adapters that are still under consideration and waits 8 seconds for a response.


* If the DNS Client service receives a positive response, it stops querying for the name, adds the response to the cache, and returns the response to the client. If the DNS Client service has not received a response from any server by the end of the 8-second time period, the resolver responds with a time-out.


DNS Suffix Search Lists

1. Default DNS Suffix Searches2. Custom DNS Suffix Search Lists


By default, the DNS Client service first attaches the primary domain suffix of the local computer to the unqualified name. If the query fails to resolve this name, the DNS Client service then adds any connection-specific suffix that you have assigned to a network adapter. Finally, if these queries are also unsuccessful, the DNS Client service adds the parent suffix of the primary DNS suffix.

1. Default DNS Suffix Searches


suppose the full computer name of a multihomed computer is computer1.domain1.microsoft.com. The network adapters on Computer1 have been assigned the connection-specific suffixes subnet1.domain1.microsoft.com and subnet2.domain1.microsoft.com, respectively. If on this same computer you type computer2 into the Address text box in Internet Explorer and then press Enter, the local DNS Client service first tries to resolve the name Computer2 by performing a query for the name computer2.domain1.microsoft.com. If this query is unsuccessful, the DNS Client service queries for the names computer2.subnet1.domain1.microsoft.com and computer2.subnet2.domain1.microsoft.com. If this query does not succeed in resolving the name, the DNS Client service queries for the name computer2.microsoft.com.

Example


You can customize suffix searches by creating a DNS suffix search list in the Advanced TCP/IP Settings dialog box

2. Custom DNS Suffix Search Lists


The Append These DNS Suffixes option lets you specify a list of DNS suffixes to add to unqualified names. If you enter a DNS suffix search list, the DNS Client service adds those DNS suffixes in order and does not try any other domain names. For example, if the suffixes appearing in the search list in Figure 4-15 are configured and you submit the unqualified, single-label query “coffee,” the DNS Client service first queries for coffee.lucernepublishing.com and then for coffee.eu.lucernepublishing.com.

Example

CONFIGURING CLIENT SETTINGS (OPTIONAL)Configuring The Advance DNS Tab

1. To configure an additional DNS server IP address, click the topmost Add buttonand specify a DNS server IP address.

2. To configure the client to resolve an unqualified name by adding the primaryDNS suffix and the DNS suffix of each connection (if configured), select Append Primary And Connection Specific DNS Suffixes. If you also want to search the parent suffixes of the primary DNS suffix up to the second-level domain, select the Append Parent Suffixes Of The Primary DNS Suffix check box.

modify the resolution behavior for unqualified DNS names :


3. To configure the client to resolve an unqualified name by adding the suffixesfrom a list of configured suffixes, select Append These DNS Suffixes, and then click Add to add suffixes to the list.4. To configure a connection-specific DNS suffix, type the DNS suffix in the DNSSuffix For This Connection text box.


5. To configure the client to register the connection’s IP address with the localcomputer’s full computer name in DNS, select the Register This Connection’sAddresses In DNS check box. This option is enabled by default. This optionrequires that the primary DNS suffix of the computer match a domain hostedby the preferred DNS server.

6. To configure the client to register the connection’s IP address with a connection-specific FQDN, select the Use This Connection’s DNS Suffix In DNS Registration check box. This option is disabled by default.

modify DNS dynamic update behavior:


* : To completely disable DNS dynamic updates for all names on the computer,clear the Register This Connection’s Addresses In DNS check box for all connectionsin Network Connections.

modify DNS dynamic update behavior:

THE END

References :1. MS Press , 70-291 , Windows Server 2003

Network Infrastructure2. OReilly , DNS & BIND , 5th Edition3. Network + , DNS Video Clip4. Willey, 70-642 , Windows Server 2008

Network Infrastructure5. MS Press , Security Resource Kit6. www.SimpleDNS.com

THE END

Copy Righted Jan 2010 bySeyyed Behzad Moosavi (S4T4N)Contact US :E-mail : [email protected] Page : www.TehranjonobDeveloper.Com => S4T4N

mailto:[email protected]

http://www.tehranjonobdeveloper.com/

dns suffix

Documents