Dhcp dns updating

18-Nov-2016 18:18 by 4 Comments

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Using DHCP and DNS together on a network might cause problems when using older, static DNS servers, which cannot interact dynamically when DHCP client configurations change.

They associate the TCP/IP address assigned by DHCP to a client with its fully qualified domain name (FQDN).

To facilitate this interaction, servers running Windows Server® 2008 and DHCP and clients running DHCP can register with DNS, allowing cooperation between the two.

When DHCP changes IP address information, corresponding DNS updates synchronize name-to-address associations for the computer.

The DNS Client service performs this function for all network connections on the client, including any that are not configured to use DHCP.

When a qualified DNS client (such as a computer running Windows XP Professional or Windows Vista®) issues an update, DHCP servers running Windows Server 2008 process the update to determine in which of three ways the server will initiate updates on behalf of the client: The ability to register both A and PTR resource records enables a DHCP server to act as a proxy for clients running other operating systems, such as Microsoft Windows Millennium Edition, or Windows 98, for the purpose of DNS dynamic update registration.

When a DHCP server registers and updates DNS pointer (PTR) and address (A) resource records on behalf of its DHCP-enabled clients, it uses the information contained within an additional DHCP option: the Client FQDN option (option 81), which permits a client to provide its FQDN and any instructions to the DHCP server that is used to process DNS dynamic updates on its behalf.

The following reasons or events can trigger a dynamic update: When one of these events triggers a dynamic update, the DNS Client service (not the DHCP Client service) sends updates.

Had to troubleshoot a workstation hogging bandwidth.

Using Netflow, I could see the ip address of the offender but couldnt see the hostname of the computer/workstation that was the offender.

For updated detailed IT pro information about DHCP and DNS, see the Windows Server 2008 documentation on the Microsoft Tech Net Web site.

Would like to see about getting DHCP configured on a Cisco switch to auto-register the computers hostname with a MS DNS server.

The ability to register both A and PTR type records lets a DHCP server act as a proxy for clients using Microsoft Windows 95 and Windows NT 4.0 for the purpose of DNS registration.