Moxa OnCell 5004-HSPA [64/67] Dynamic domain name server

B. Dynamic Domain Name Server

This appendix explains how to use the OnCell 5000 with DDNS. When the OnCell 5000 receive its IP address

from a DHCP (Dynamic Host Configuration Protocol) server, remote servers will be unable to access it using a

fixed IP address. With DDNS (Dynamic Domain Name Server), a remote server can access the OnCell 5000

using its domain name instead of its IP address.

Overview

The following is a summary of the process:

1. The OnCell 5000 sends a request for an IP address to the DHCP server. At the same time, it notifies the

DHCP server of its desired server name (“OC3100” in the illustration) according to the option 12 standard.

2. The DHCP server replies with the IP address that is assigned to the OnCell 5000, along with the domain

name (“moxa.com” in the illustration) and the IP addresses for the DNS server and gateway.

3. If the OnCell 5000 has authorization to update the DNS server, it will register its FQDN (Fully Qualified

Domain Name) with the DNS server. The OnCell 5000’s FQDN will be in the format server name.domain

name (“OC3100.moxa.com” in the illustration).

4. If the OnCell 5000 is not authorized to update the DNS server, the DHCP server can be used to update the

DNS server. The DHCP server will register the DNS server with the PTR RR (the record of request for a

domain name with IP address).