diff -ur man-pages-3.42.orig/man5/resolv.conf.5 man-pages-3.42/man5/resolv.conf.5
--- man-pages-3.42.orig/man5/resolv.conf.5	2012-08-14 00:39:40.000000000 +0200
+++ man-pages-3.42/man5/resolv.conf.5	2012-09-12 17:58:59.898565259 +0200
@@ -244,6 +244,13 @@
 This option disables the behavior and makes glibc perform the IPv6
 and IPv4 requests sequentially (at the cost of some slowdown of the
 resolving process).
+.TP
+.BR single-request-reopen " (since glibc 2.9)"
+The resolver uses the same socket for the A and AAAA requests.  Some hardware
+mistakenly only sends back one reply.  When that happens the client sytem will
+sit and wait for the second reply.  Turning this option on changes this behavior
+so that if two requests from the same port are not handled correctly it will
+close the  socket and open a new one before sending the second request.
 .RE
 .LP
 The \fIdomain\fP and \fIsearch\fP keywords are mutually exclusive.