Description

The DNS_EXPAND option specifies how many IP addresses are returned to UCMD Manager following a DNS query, which is issued to resolve a host name.

If the UCMD Manager is configured to expand the results of the query, all IP addresses defined for a particular host name are returned and expanded (in-place) within the list of hosts specified for the REMOTE_HOST option. Otherwise, only the first host is returned, and no expansion is performed.

For example, if a host list contains six host names, and the name in the 3rd position resolves to five IP addresses, those addresses will occupy positions 3-7 in the expanded list. Subsequent hosts specified by the user will begin at the 8th position in the expanded list.

That is:

• If the REMOTE_HOST list contains:
  -host host1,host2,host3,host4,host5,host6

• And host3 resolves to:
  ip3a, ip3b, ip3c, ip3d, and ip3e

• Then after the other hosts are resolved, the list will be expanded to:
  -host ip1,ip2,ip3a,ip3b,ip3c,ip3d,ip3e,ip4,ip5,ip6

Usage

Values

option specifies whether or not DNS query results are expanded.

Valid values for option are:

• yes
  All IP addresses returned by a DNS for a given query are returned.
• no
  Only the first IP address returned by a DNS for a given query is returned.

Default is no.