+.TP
+.BR single-request-reopen " (since glibc 2.9)"
+The resolver uses the same socket for the A and AAAA requests.
+Some hardware mistakenly sends back only one reply.
+When that happens the client system 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.