Host Mapping

Host name/IP address mappings are stored in the Host Mapping Table (DNS cache).

This cache can contain the following type of entries:

  • Static Entries—These are mapping pairs that manually added to the cache.

  • Dynamic Entries—Are mapping pairs that are either added by the system as a result of being used by the user, or an entry for each IP address configured on the device by DHCP.

Name resolution always begins by checking static entries, continues by checking the dynamic entries, and ends by sending requests to the external DNS server. Eight IP addresses are supported per DNS server per host name.

To add a host name and its IP address, complete the following:

Procedure

Step 1

Click IP Configuration > DNS > Host Mapping.

Step 2

To add a host mapping, click Add and configure the following:

  • IP Version—Select Version 6 for IPv6 or Version 4 for IPv4.

  • Host Name—Enter a user-defined host name or fully qualified name. Host names are restricted to the ASCII letters A through Z (case-insensitive), the digits 0–9, the underscore, and the hyphen. A period (.) is used to separate labels.

  • IP Address—Enter a single address or up to eight associated IP addresses (IPv4 or IPv6).

Step 3

Click Apply. The settings are saved to the Running Configuration file.