User`s guide

162

TCP/IP Network Basics

Device Hostname Services

Dynamic DNS Naming

Dynamic Domain Name System (Dynamic DNS) is a distributed database of

hostnames and associated IP addresses on the Internet. All hostnames on

the Internet are divided into categories, called

domains, such as .com, .edu,

.org, etc. Dynamic DNS automatically provides hostnames and domain

names for devices on networks that support Dynamic DNS. This figure

shows a typical process for a DHCP Client to register a hostname and a

PTR (pointer) name via a DHCP Server.

If the registration process fails, the DHCP Client hostname may not be

assigned to the instrument. If you want to change the hostname after the

registration process initiated by the DHCP server, you will probably

need to cycle power on the instrument to re initiate a DHCP request and

hostname registration attempt.

1 IP Lease Request

To begin, the DHCP Client has no IP address and only a hostname that is to be registered. The client

sends a DHCP request to the DHCP server that provides the server with the hostname to be registered.

2 IP Lease Acknowledgement

The DHCP Server responds by sending an IP address and other TCP/IP information to the

DHCP Client. The client now has an IP address as well as a hostname.

3 Dynamic DNS Hostname Update

The DHCP Server attempts to register the newly allocated IP address and desired hostname for

the DHCP Client with the DNS Server.

DNS Server

2 IP Lease Acknowledgement

3 Dynamic DNS

Hostname Update

DHCP Client

DHCP Server

4 Dynamic DNS PTR (Pointer) Name Update

The DHCP Server attempts to register the newly allocated IP address and desired pointer (PTR)

name for the DHCP Client with the DNS Server.

4 Dynamic DNS

PTR Name Update