New: single-request-reopen option needs to be documented in resolv.conf

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/[email protected]
ReportedBy: [email protected]
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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https://bugzilla.kernel.org/show_bug.cgi?id=38542

Michael Kerrisk <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

             Status|NEW                         |RESOLVED
                 CC|                            |[email protected]
         Resolution|                            |CODE_FIX

--- Comment #1 from Michael Kerrisk <[email protected]> 2012-04-23 12:15:36 --- Patch from Petr Baudis applied for man-pages-3.40:

@@ -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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