Sep 19, 2017 DDNS (Dynamic DNS) is a method to update DNS data (A, TXT, and PTR records) from sources such as DHCP servers and other systems that support DDNS updates, such as Microsoft Windows servers 2000, 2003, 2008, 2008 R2, 2012, 2012 R2, and 2016. This chapter p. Limit Which Hostnames are Updated by Your Dynamic DNS Client my.noip.com Want to make or write your own update client? What Port Does the Dynamic Update Client Use? Interfacing with No-IP’s update server with own update client? I’m Behind a Router, Will the Dynamic Update Client Know When My Dynamic WAN IP Address Changes?
How to Enable Dynamic DNS Updating for DHCP Clients
Note –Be aware that dynamic DNS updates are by nature a securityrisk.
By default, the Solaris DNS daemon (in.named) doesnot allow dynamic updates. Authorization for dynamic DNS updates is grantedif the requesting host's IP address is assigned to the allow-update keyword in the appropriate zones of the named.confconfiguration file on the DNS server system. No other security is provided.You must carefully weigh the convenience of this facility for users againstthe security risk created when you enable dynamic DNS updates.
- At the DNS server, edit the /etc/named.conf fileas root.
- Find the zone section for the appropriate domainand add the DHCP server's IP addresses to the allow-updatekeyword.For example, if the DHCP server resides at addresses 10.0.0.1 and 10.0.0.2,a named.conf file for the dhcp.domain.comzone would be modified as follows:Note that allow-update for both zones must be enabledto allow the DHCP server to update both A and PTR records on the DNS server.
- On the DHCP server, start DHCP Manager.
- Choose Modify from the Service menu.The Modify Service Options dialog box opens.
- Select Update DNS Host Information Upon Client Request.
- Specify the number of seconds to wait for a response from the DNS serverbefore timing out, then click OK.The default value should be adequate. If you have timeout problems,you can increase the value later.
- Click the Macros tab and ensure that the correct DNS domain is specified.The DNSdmain option must be passed with the correctdomain name to any client that expects dynamic DNS update support. By default, DNSdmain is specified in the server macro, which is used as theconfiguration macro bound to each IP address.
- Set up the DHCP client to specify its host name when requesting DHCPservice.If you use the Solaris DHCP client, see How to Enable a Solaris Client to Request Specific Host Name.If your client is not a Solaris DHCP client, see the documentation for yourDHCP client for information about how to do this.
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How to Enable Dynamic DNS Updating for DHCP Clients
Note –Be aware that dynamic DNS updates are by nature a securityrisk.
By default, the Solaris DNS daemon (in.named) doesnot allow dynamic updates. Authorization for dynamic DNS updates is grantedif the requesting host's IP address is assigned to the allow-update keyword in the appropriate zones of the named.confconfiguration file on the DNS server system. No other security is provided.You must carefully weigh the convenience of this facility for users againstthe security risk created when you enable dynamic DNS updates.
- At the DNS server, edit the /etc/named.conf fileas root.
- Find the zone section for the appropriate domainand add the DHCP server's IP addresses to the allow-updatekeyword.For example, if the DHCP server resides at addresses 10.0.0.1 and 10.0.0.2,a named.conf file for the dhcp.domain.comzone would be modified as follows:Note that allow-update for both zones must be enabledto allow the DHCP server to update both A and PTR records on the DNS server.
- On the DHCP server, start DHCP Manager.
- Choose Modify from the Service menu.The Modify Service Options dialog box opens.
- Select Update DNS Host Information Upon Client Request.
- Specify the number of seconds to wait for a response from the DNS serverbefore timing out, then click OK.The default value should be adequate. If you have timeout problems,you can increase the value later.
- Click the Macros tab and ensure that the correct DNS domain is specified.The DNSdmain option must be passed with the correctdomain name to any client that expects dynamic DNS update support. By default, DNSdmain is specified in the server macro, which is used as theconfiguration macro bound to each IP address.
- Set up the DHCP client to specify its host name when requesting DHCPservice.If you use the Solaris DHCP client, see How to Enable a Solaris Client to Request Specific Host Name.If your client is not a Solaris DHCP client, see the documentation for yourDHCP client for information about how to do this.