[Bug 38542] New: single-request-reopen option needs to be documented in resolv.conf

[Bug 38542] New: single-request-reopen option needs to be documented in resolv.conf

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=38542

           Summary: single-request-reopen option needs to be documented in
                    resolv.conf
           Product: Documentation
           Version: unspecified
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: man-pages
        AssignedTo: documentation_man-pages-ztI5WcYan/vQLgFONoPN62D2FQJk+8+b@public.gmane.org
        ReportedBy: erinn.looneytriggs-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
        Regression: No


This option was introduced here:
http://sourceware.org/ml/libc-alpha/2009-10/msg00063.html

However, there appears to be no documentation for it. Folks are going to be
looking for this as they deploy systems behind firewalls and end up with delays
due to DNS, see here:
http://www.linuxquestions.org/questions/showthread.php?p=4399340#post4399340

So if you could please document the option, I at least would greatly appreciate
it.

Thanks,

-Erinn

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[Bug 38542] single-request-reopen option needs to be documented in resolv.conf

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=38542


Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
         Resolution|                            |CODE_FIX




--- Comment #1 from Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2012-04-23 12:15:36 ---
Patch from Petr Baudis applied for man-pages-3.40:

--- a/man5/resolv.conf.5
+++ b/man5/resolv.conf.5
@@ -231,6 +231,19 @@ sets
 in
 .IR _res.options .
 This enables support for the DNS extensions described in RFC\ 2671.
+.TP
+.BR single-request " (since glibc 2.10)"
+sets
+.BR RES_SNGLKUP
+in
+.IR _res.options .
+By default, glibc performs IPv4 and IPv6 lookups in parallel since
+version 2.9.
+Some appliance DNS servers
+cannot handle these queries properly and make the requests time out.
+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).
 .RE
 .LP
 The \fIdomain\fP and \fIsearch\fP keywords are mutually exclusive.

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