C
C. Dynamic Domain Name Server
This appendix explains how to use the CN2600 with DDNS. When the CN2600 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 CN2600 using its domain
name instead of its IP address.
Overview
The following is a summary of the process:
1. The CN2600 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 (CN2600 in the illustration) according to the option 12 standard.
2. The DHCP server replies with the IP address that is assigned to the CN2600, along with the domain name
(“moxa.com” in the illustration) and the IP addresses for the DNS server and gateway.
3. If the CN2600 has authorization to update the DNS server, it will register its FQDN (Fully Qualified Domain
Name) with the DNS server. The CN2600’s FQDN will be in the format server name.domain name
(CN2600.moxa.com” in the illustration).
4. If the CN2600 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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