your machine supports IPv6, you can also use those addresses.

TCP/IP communication is

always used when a nonempty string is specified for this parameter.

If this parameter is not specified, the value of <literal>host</literal>

will be looked up to find the corresponding IP address &mdash; or, if

<literal>host</literal> specifies an IP address, that value will be

used directly.

</para>

<para>

Using <literal>hostaddr</literal>instead of <literal>host</literal>allows the

Using <literal>hostaddr</literal> allows the

application to avoid a host name look-up, which might be important

in applications with time constraints. However, a host name is

required for GSSAPI or SSPI authentication