Even if the update is done before sending the ACK to the client, it does not delay processing of other DHCP requests. The DHCP server continues to process DHCP client DISCOVER and REQUEST packets while waiting for the DDNS updates to complete. The default for the client is two attempts with a 5-second wait time between attempts. The performance of the DHCP client can be impacted when the Dynamic DNS Support for Cisco IOS Software feature is enabled, because of sending DDNS update packets and waiting for responses from the server (before sending the ACK to the client REQUEST) and the client (immediately after receiving the ACK and assigning the address to the interface). Restrictions for Dynamic DNS Support for Cisco IOS Software Navigator to find information about platform support and Cisco software image Which each feature is supported, see the feature information table. The features documented in this module, and to see a list of the releases in Release notes for your platform and software release. May not support all the features documented in this module. Feature Information for Dynamic DNS Support for Cisco IOS Software.
DYN UPDATER LOGIN HOW TO
Restrictions for Dynamic DNS Support for Cisco IOS Software.With this feature, you can define a list of hostnames and IP addresses that will receive updates, specify an update method, and specify a configuration for Dynamic Host Configuration Protocol (DHCP) triggered updates. It provides two mechanisms to generate or perform DDNS: the IETF standard as defined by RFC 2136 and a generic HTTP using various DNS services. The Dynamic DNS Support for Cisco IOS Software feature enables Cisco IOS software devices to perform Dynamic Domain Name System (DDNS) updates to ensure that an IP host DNS name is correctly associated with its IP address. Dynamic DNS Support for Cisco IOS Software
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