3Com Router 3000 Ethernet FamilyConfiguration Guide Chapter 4 DDNS Configuration3Com Corporation4-2Usually, the user side of DDNS is a server providing HTTP, FTP, or other services. Afterthe IP address of the server changes, the server needs to request the DDNS serviceprovider to notify the DNS server of this. This is usually done by using a special clientprogram provided by the DDNS service provider or through a specified HTTP page.The domain name-to-IP address mapping update process does not follow a particularprotocol; it varies by DDNS service provider.z Service provider side of DDNSAfter receiving an IP address update request from the user side, the DDNS serviceprovider notifies the DNS server to update the involved domain name-to-IP addressmapping.At present, www.3322.org is the only DDNS service provider supported by 3ComSeries Routers.3Com Series Routers implement the user side of DDNS. When DDNS users’ IPaddresses change, 3Com Routers can request www.3322.org to notify DNS servers toupdate domain name-to-IP address mappings.4.2 Configuring DDNS4.2.1 Configuration PrerequisitesBefore configuring DDNS on your router, make sure that:z The router can obtain DNS service.z On the DNS server, a domain name-to-IP address mapping entry has created forthe domain name of the DDNS service provider, which can be www.3322.org onlyat present.This is to ensure that your router can access the DDNS service provider.4.2.2 Configuring DDNSTable 4-1 Configure DDNSOperation Command RemarksEnter system view system-view --Set 3322.org as the DDNSservice provider and enter itsviewddns-server 3322.org --Set parameters foraccessing the DDNS serviceproviderRefer to section 4.2.3“Configuring Parameters forAccessing the DDNSService Provider”Required
