.\"
.\" Added ndots remark by Bernhard R. Link - debian bug #182886
.\"
-.TH RESOLV.CONF 5 2009-03-01 "" "Linux Programmer's Manual"
+.TH RESOLV.CONF 5 2012-04-23 "" "Linux Programmer's Manual"
.UC 4
.SH NAME
resolv.conf \- resolver configuration file
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.
The keyword and value must appear on a single line, and the keyword
(e.g., \fBnameserver\fP) must start the line.
The value follows the keyword, separated by white space.
+
+Lines that contain a semicolon (;) or hash character (#)
+in the first column are treated as comments.
.SH FILES
.IR /etc/resolv.conf ,
.I <resolv.h>