Re: Capturing both IP address and hostname in the log - Mailing list pgsql-general

Yeah, the wording really should be more like:

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index fea683cb49..c545fee6c9 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -7614,10 +7614,11 @@ local0.*    /var/log/postgresql
       </term>
       <listitem>
        <para>
-        By default, connection log messages only show the IP address of the
-        connecting host. Turning this parameter on causes logging of the
-        host name as well.  Note that depending on your host name resolution
-        setup this might impose a non-negligible performance penalty.
+        By default, for TCP/IP-originated connections, the identifier of the host
+        making the connection is its IP address.  Turning this parameter on tells
+        the system to record the resolved host name instead.  Note that depending
+        on your host name resolution setup this might impose a non-negligible
+        performance penalty.
         This parameter can only be set in the <filename>postgresql.conf</filename>
         file or on the server command line.
        </para>

Both the connection logging routine and log_line_prefix %h / %r simply report the "identifier of the host making the connection".

David J.