test

Netra j 3.0 Administrator's Guide

Configuring the DNS Server

Basic DNS Server

To Configure a Basic DNS Server

This configures the Netra Server as a DNS Server with a list of DNS root servers to query. If you configure the Netra server as a DNS server, you would normally configure it to be a DNS client of itself. Set up the server before you configure the client.

  1. From the Main Administration page, under "Network Service Administration," click Name Service, then click DNS (Domain Name Service) Server Administration.

  2. Under "DNS Server," click Configure as a basic DNS Server.

    The Basic DNS Server Configuration page is displayed.

  3. Complete the form using the information in following table.

    Table 3-7 Basic DNS Server Configuration

    Option 

    Description 

    DNS Domain Name 

    The DNS domain in which the Netra server resides. This name is used for two purposes:  

    • as a contact address for the DNS administrator.

    • when creating the DNS server record for this server for any primary domains for which it is responsible.

    The domain name is assumed to be fully-qualified whether or not you enter a period at the end. Example: comedy.cartoon.net.

    DNS administrator's user name  

    Enter the name or alias of the local user (for example, root) who is responsible for DNS. All DNS database files contain a contact address - the address for this server consists of the name of this user, the name of the Netra server, and the domain name entered into the domain field.

    Root Name Servers/ IP Address 

    The fully qualified host names and host addresses of a set of DNS servers to contact to resolve name service queries. Use the default servers if the Netra server is connected directly to the internet. If the Netra server is behind a firewall, enter a set of servers that it can reach. 

After successfully configuring a DNS server, the module checks to see if the DNS server is configured as a client of itself. The Operation Successful message, displays information about the server configuration, and if the DNS server is not configured as a DNS client of itself, provides a link to the DNS client configuration form.

Note -

If you change the name of the domain in which the server resides, the DNS resource files for the primary domains are updated with respect to the contact address and the name server address of the Netra server. Review the individual primary domains to update any other references to the old domain name.

To Modify or Delete a Basic DNS Server

  1. From the Main Administration page, under "Network Service Administration," click Name Service, then click DNS (Domain Name Service) Server Administration.

    The DNS Server Administration page is displayed.

  2. Choose one of the following:

    • To modify a Basic DNS server, click Modify, and make the changes in the form using Table 3-7 as a reference.

    • To delete a Basic DNS server, click Delete, then confirm the operation.

DNS Internal Root Server

To Configure a DNS Internal Root Server

  1. From the Main Administration page, under "Network Service Administration," click Name Service, then click DNS (Domain Name Service) Server Administration.

  2. Under "DNS Server," click Configure as a internal root server).

    The Configure as an Internal DNS Root Server page is displayed.

  3. Complete the form using the information in following table.

    Table 3-8 DNS Internal Root Server Configuration

    Option  

    Description 

    DNS Domain Name 

    The DNS domain in which the Netra server resides. This name is used for two purposes:  

    • as a contact address for the DNS administrator.

    • when creating the DNS server record for this server for any primary domains for which it is responsible.

    The domain name is assumed to be fully-qualified whether or not you enter a period at the end. Example: cartoon.net.

    DNS administrator's user name  

    Enter the name or alias of the local user (for example, root) who is responsible for DNS. All DNS database files contain a contact address - the address for this server consists of the name of this user, the name of the Netra server, and the domain name entered into the domain field.

    Internal Root Server / IP Address 

    This field is only relevant if the internal network has other DNS internal root servers (an entry for this server is created automatically). If there are none, leave this field blank. Enter the fully qualified host names and host addresses of each DNS internal root server. 

    DNS Server / IP Address  

    This field is only relevant if the internal network has non-root DNS servers that reside in the top-level domain and to which this server delegates responsibility for primary domains. If there are none, leave this field blank. Enter the fully qualified host names and host addresses of each DNS server. If a server has more than one IP address, create an entry for each address 

    in-addr.arpa Domain Name / DNS Server 

    This field is only relevant if this root server delegates responsibility for reverse maps (in-addr.arpa domains) to other DNS servers on the internal network. If it does not, leave this field blank. Create domain name/name server entries for the in-addr.arpa domains maintained on the other DNS servers. Use fully qualified names in both cases. 

    Create the primary domain corresponding to the name entered in the DNS Domain Name field with the "Add a Primary Domain" form.

The Operation Successful page displays information about the server configuration, and if the Netra server is not configured to be a DNS client of itself, informs you of this and provides a link to the DNS client configuration form.

Note -

If you change the name of the domain in which the server resides, the DNS resource files for the primary domains are updated with respect to the contact address and the name server address of the Netra server. Review the individual primary domains to update any other references to the old domain name.

To Modify or Delete a DNS Internal Root Server

  1. From the Main Administration page, under "Network Service Administration," click Name Service, then click DNS (Domain Name Service) Server Administration.

    The DNS Server Administration page is displayed.

  2. Choose one of the following:

    • To modify a DNS internal root server, click Modify, and make the changes in the form using Table 3-8 as a reference.

    • To delete a DNS internal root server, click Delete; then confirm the operation.

DNS Primary Server

To Configure the Netra Server as a DNS Primary Server

  1. From the Main Administration page, under "Network Service Administration," click Name Service, then click DNS (Domain Name Service) Server Administration.

  2. Under "DNS Server," click Add a primary domain.

    The Add DNS Primary Domain page is displayed.

  3. Complete the form using information in the following table.

    Table 3-9 DNS Primary Server Administration

    DNS Primary Server Information 

    Description 

    Primary Domain Name 

    The name of the primary domain, for example: mydomain.com. The name you enter is assumed to be fully qualified whether or not it ends in a trailing period.  

    Host Names/Host Addresses 

    The host names and corresponding host addresses of the hosts within the domain. For example, myhost 1.2.3.4

    Host Aliases/Host Names 

    Enter alias names for hosts in the domain followed by a known name of the host. For example, www myhost

    Mail Addresses/ Preferences Mail Servers/ 

    Use this field if people are expected to send mail to the domain rather than directly to the mail server. Each entry consists of the name of the domain, followed by a preference value and the host name of the mail server. 

    For example, if you are entering data for mydomain.com in which the server that deals with mail is called mailhost, make an entry as follows:

    mydomain.com. 5 mailhost

    The preference value is an integer: the lower the value, the higher the priority of that mail server. 

    Domains/ DNS Servers 

    Enter records for other DNS servers. Each record consists of the name of the domain that the server is responsible for followed by the name of the server. You do not need to create a record specifying that the Netra server is the name server for this domain - the Netra software does that automatically (the record is shown on the success page, and also on this form if you modify the domain data at a later time). 

  4. Click OK.

    If the Netra server is not configured to generate reverse maps automatically, the success page displays a link to the DNS Reverse Map Generation form.

To Modify or Delete a DNS Primary Domain

  1. From the Main Administration page, under "Network Service Administration," click Name Service, then click DNS (Domain Name Service) Server Administration.

    The DNS Server Administration page is displayed.

  2. Choose one of the following:

    • To modify a DNS primary domain, click Modify, and make the changes in the form using Table 3-9 as a reference.

    • To delete a DNS primary domain, click Delete, then confirm the operation.

Example of a Primary Domain Configuration

It will be useful to configure a sample primary domain configuration. This example sets up a domain called comedy.cartoon.net on the name server stimpy. There are various hosts in the domain that have different functions.

In the Primary Domain Name field, specify: 

comedy.cartoon.net

In the Host Names/Host Addresses field, type a list of those hosts whose presence are to be broadcast to any machine that can connect to this DNS server. For this example, type ren and stimpy, and for a host called homer that resides in (located) in the DNS subdomain black.comedy.cartoon.net, type homer.black. 

ren	 	 	 	 	 118.1.1.2
homer.black	 	 118.2.1.2
stimpy	 	 	 	 	 118.1.1.3

The Internet community uses conventional names for hosts that provide certain types of services, in order to make them easy to locate. For instance, the WWW server for a domain is usually known as www.domain, and an anonymous FTP server is typically called ftp.domain. On comedy.cartoon.net, ren is an FTP and WWW server, while stimpy is a name server. Standard aliases for these machines are added into the Host Aliases/Host Names field. For example: 

www	 	 	 	 	 	 ren
ftp	 	 	 	 	 	 ren
ns	 	 	 	 	 	 stimpy

stimpy is going to handle mail sent to comedy.cartoon.net, so an MX record needs to be created. 

comedy.cartoon.net.		 							5		 	stimpy

Finally, to the name server records, are added a single record for a host called homer that resides in a subdomain of comedy.cartoon.net called black - homer.black.comedy.cartoon.net is the name server for that domain. 

black.comedy.cartoon.net. 	 	 homer.black.comedy.cartoon.net.

If a domain contains subdomains that are maintained on another DNS server, the domain data must include records for the DNS servers for the subdomains. Note that in our example, since homer resides in the black subdomain, a Host Name/Host Address record for homer had to be added so that stimpy can reach it.

There is no need to create a name server record which says that stimpy is a name server for comedy.cartoon.net, because the Netra j software does that automatically. Next time you visit this form to modify the domain, the following record shows up next to the one for homer. 

comedy.cartoon.net. 			 	 	 	 stimpy.comedy.cartoon.net.

Automatic Reverse Map Generation

Use this form to configure the Netra server to generate reverse maps (address to name records) corresponding to the host records in the primary domains for which the server is responsible automatically. A link to the form appears on the DNS Server Administration form if the Netra server is responsible for at least one primary domain. The reverse maps will be based on the first three octets of the IP address, which assumes that the Netra server is authoritative for the entire block of class C hosts.

To Generate Reverse Maps

  1. From the Main Administration page, under "Network Service Administration," click Name Service, then click DNS (Domain Name Service) Server Administration.

  2. Under "DNS Server," click Enable Automatic Reverse Map Generation.

    The DNS Reverse Map Generation page is displayed.

  3. Click OK.

To Disable Automatic Reverse Map Generation

  1. From the Main Administration page, under "Network Service Administration," click Name Service, then click DNS (Domain Name Service) Server Administration.

  2. Under "DNS Server," click Disable Automatic Reverse Map Generation.

    The DNS Reverse Map Generation page is displayed.

  3. Choose one of the following:

    • Disable automatic reverse map generation. Leave the current reverse maps in place. This leaves the reverse maps in place, but stops updating them.

    • Disable automatic reverse map generation. Remove the current reverse maps. This both stops updating reverse maps and removes the current files.

  4. Click OK.

DNS Secondary Domain

To Configure the Netra Server as a DNS Secondary Server

  1. From the Main Administration page, under "Network Service Administration," click Name Service, then click DNS (Domain Name Service) Server Administration.

  2. Under "DNS Server," click Add a secondary domain.

    The Add DNS Secondary Domain page is displayed.

  3. Complete the form using the information in the following table.

    Table 3-10 DNS Secondary Server Administration

    DNS Secondary Server Information 

    Description 

    Secondary Domain Name 

    The name of the secondary domain. A secondary DNS server copies domain information from another DNS server, called the master server. It can also act as a backup name server for clients when the primary server is unreachable. The domain name is assumed to be fully qualified whether or not it ends in a trailing period. Example: horror.cartoon.net.

    Master DNS Servers' Host Addresses 

    The host addresses of the master DNS name servers in the order in which they should be queried. A master DNS server can be either an existing primary or secondary DNS server. Example: 118.144.102.6

To Modify or Delete a DNS Secondary Domain

  1. From the Main Administration page, under "Network Service Administration," click Name Service, then click DNS (Domain Name Service) Server Administration.

  2. Choose one of the following:

    • To modify a DNS secondary domain, click Modify, and make the changes in the form using the information in Table 3-10.

    • To delete a DNS secondary domain, click Delete, and then confirm the operation.

Notes to Those Who Also Administer DNS Manually

If you edit the DNS files manually as well as using the Netra DNS Server configuration component, the following information explains what changes Netra makes. You do not have to read this section if you always use Netra to configure DNS.