Set Hostname

Set the hostname of the local machine by entering the hostname in the Hostname text box and clicking Set Hostname. Only alphanumeric characters are allowed.

Add NameServer (IP Address)

Enter the IP address of a DNS server to resolve names locally on the LoadMaster in this field and click Add. A maximum of three DNS servers are allowed.

Note: It is not possible to delete the last remaining NameServer if the DNSSEC client is enabled. You can disable the DNSSEC client on the Host & DNS Configuration screen.

Add Search Domain

Specify the domain name to prepend to requests to the DNS NameServer in this field and click Add. A maximum of six Search Domains are allowed.

Add/Modify Hosts for Local Resolution

These fields provide the ability to manipulate the host file from the LoadMaster WUI. Specify the IP address and the host FQDN for the entry.

Enable DNSSEC Resolver

By default, the LoadMaster DNSSEC client is disabled. Only enable this option if needed. In some circumstances, the DNSSEC validation takes a significant amount of time to fail. This can cause the LoadMaster to appear to freeze or hang.

Selecting this option enables DNSSEC capabilities on the LoadMaster. You must add at least one Nameserver before DNSSEC can be enabled. The LoadMaster must be rebooted after changing the DNSSEC option to activate/deactivate the feature. When the setting is changed, it cannot be changed again until the LoadMaster has been rebooted.

Note: When using HA – the DNSSEC option must be configured on both devices separately.

DNSSEC works with the following utilities in the LoadMaster:

  • Vipdump

  • Ping and ping6

  • Syslog

  • SNMP

  • Wget

  • NTP

  • SMTP

  • Real Servers

Automatically Update DNS Entries

When this option is enabled, the LoadMaster attempts to automatically update any changed DNS names (based on the DNS Update Interval):

  • If the address is not found, or if it is the same as before – nothing is done (except a log entry is generated).
  • If the address is different, the Real Server entry is updated with the new address, if possible.
  • If the new address is invalid for some reason, for example if it is a non-local address and the Enable Non-Local Real Servers option is disabled, no changes are made and a log is generated.

DNS Update Interval

Set the update interval for DNS entries. Valid values range from 1 to 60 (minutes). The default value is 60.

Reload DNS Entries for RS Errors

When this option is enabled, DNS entries are reloaded when health checks have errors and an FQDN is associated with the Real Server IP address.

Resolve DNS Names now

Clicking the Run Resolver Now button forces a new resolution of DNS names. The behavior is the same as the Automatically Update DNS Entries option, except this is a manual (not an automatic) check.