C
C. Dynamic Domain Name Server
This appendix explains how to use the OnCell G3100 with DDNS. When the OnCell G3100 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 G3100
using its domain name instead of its IP address.
Overview
The following is a summary of the process:
1. The OnCell G3100 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 G3100, along with the domain
name (“moxa.com” in the illustration) and the IP addresses for the DNS server and gateway.
3. If the OnCell G3100 has authorization to update the DNS server, it will register its FQDN (Fully Qualified
Domain Name) with the DNS server. The OnCell G3100’s FQDN will be in the format server name.domain
name (“OC3100.moxa.com” in the illustration).
4. If the OnCell G3100 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).
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