Configuring DNS settings

If you select Manual, you must configure the name server(s) on this page. If you select one of the DHCP options, the MCU receives its nameserver address via DHCP on the interface you select.

If Automatic via DHCP (IPv4) or Automatic via SLAAC/DHCPv6 (IPv6) is selected for IP configuration (on the Ethernet Port's configuration page), no DNS name server will be available until the MCU receives the address via DHCP on that interface.

For example, if you select Via Port A DHCPv6 for DNS configuration, you must ensure that Port A is configured to use DHCPv6. Do this by going to the Network > Port A page and selecting Automatic via SLAAC/DHCPv6 in the IP configuration field of the IPv6 interface.

Note that if the DHCP server on your network does not supply DNS configuration information, then the MCU will have no ability to look up names. Additionally, for IPv6 the Router Advertisment packets determine whether or not DHCPv6 is used.

Specifies a name for the MCU.

Depending on your network configuration, you may be able to use this host name to communicate with the MCU, without needing to know its IP address.

The IP address of the name server.

Identifies an optional second name server.

The secondary DNS server is only used if the first is unavailable. If the first server returns that it does not know an address, the secondary DNS server will not be queried.

Specifies an optional suffix to add when performing DNS lookups.

This option can allow you to use non-fully qualified host names when referring to a device by host name instead of IP address.

For example, if the domain name is set to cisco.com, then a request to the name server to look up the IP address of host endpoint will actually lookup endpoint.cisco.com.