User`s manual

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Appendix C Dynamic Domain Name Server
This appendix explains how to use the NPort 6000 with DDNS. When the NPort 6000 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 NPort 6000 using its domain name instead of its IP address.
Overview
The following is a summary of the process:
1. The NPort 6000 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 (“NP6000” in the illustration) according to
the option 12 standard.
2. The DHCP server replies with the IP address that is assigned to the NPort 6000, along with the
domain name (“moxa.com” in the illustration) and the IP addresses for the DNS server and
gateway.
3. If the NPort 6000 has authorization to update the DNS server, it will register its FQDN (Fully
Qualified Domain Name) with the DNS server. The NPort 6000’s FQDN will be in the format
server name.domain name (“NP6000.moxa.com” in the illustration).