diff -ru httpd-2.2.6/modules/loggers/mod_log_config.c httpd-2.2.6-new/modules/loggers/mod_log_config.c
--- httpd-2.2.6/modules/loggers/mod_log_config.c	2006-07-12 05:38:44.000000000 +0200
+++ httpd-2.2.6-new/modules/loggers/mod_log_config.c	2007-09-18 11:54:35.000000000 +0200
@@ -95,6 +95,7 @@
  * %...{format}P: the process ID or thread ID of the child/thread that
  *                serviced the request
  * %...r:  first line of request
+ * %...R:  the port on the remote host
  * %...s:  status.  For requests that got internally redirected, this
  *         is status of the *original* request --- %...>s for the last.
  * %...t:  time, in common log format time format
@@ -637,6 +638,13 @@
                         r->server->port ? r->server->port : ap_default_port(r));
 }
 
+
+static const char *log_remote_port(request_rec *r, char *a)
+{
+	return apr_psprintf(r->pool, "%u", r->connection->remote_addr->port);
+}
+
+
 /* This respects the setting of UseCanonicalName so that
  * the dynamic mass virtual hosting trick works better.
  */
@@ -1488,6 +1496,7 @@
         log_pfn_register(p, "X", log_connection_status, 0);
         log_pfn_register(p, "C", log_cookie, 0);
         log_pfn_register(p, "r", log_request_line, 1);
+        log_pfn_register(p, "R", log_remote_port, 0);
         log_pfn_register(p, "D", log_request_duration_microseconds, 1);
         log_pfn_register(p, "T", log_request_duration, 1);
         log_pfn_register(p, "U", log_request_uri, 1);