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and subject line Bug#314891: postfix: dns queries use domain search list
causing extraneous dns lookups
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From: Edward Buck <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: postfix: dns queries use domain search list causing extraneous dns
lookups
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Date: Sun, 19 Jun 2005 00:20:32 -0700
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Package: postfix
Version: 2.1.5-9
Severity: normal
Not sure if this is a postfix problem or one related to the underlying
gethostbyname calls.
DNS queries consistently reference the local resolver's domain search
list, i.e. the 'search domain' lines in /etc/resolv.conf, even when
domains are fully qualified, resulting in a lot of extraneous dns lookups.
The number of extraneous lookups will be equal to the number of domains
listed in /etc/resolv.conf. If there are 3 domains listed, then it will
be 3 extra dns queries for every 1 dns lookup.
On a busy mail server, these dns lookups can be rather expensive,
especially in generating a lot of needless network traffic.
I noticed the problem when our nameserver (bind) logs began to show thousands
of messages showing unauthorized queries to domains listed in the search
path of the server running postfix. For example:
named[20247]: client 80.80.80.80#49561: query
'hotmail.com.domain.in.search.path/IN' denied
-- System Information:
Debian Release: 3.1
Architecture: i386 (i686)
Kernel: Linux 2.6.8-2-686-smp
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Versions of packages postfix depends on:
ii adduser 3.63 Add and remove users and groups
ii debconf [debconf-2.0] 1.4.30.13 Debian configuration management sy
ii dpkg 1.10.28 Package maintenance system for Deb
ii libc6 2.3.2.ds1-22 GNU C Library: Shared libraries an
ii libdb4.2 4.2.52-18 Berkeley v4.2 Database Libraries [
ii libgdbm3 1.8.3-2 GNU dbm database routines (runtime
ii netbase 4.21 Basic TCP/IP networking system
-- debconf information excluded
---------------------------------------
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Date: Fri, 23 Dec 2005 21:33:28 -0700
From: LaMont Jones <[EMAIL PROTECTED]>
To: Edward Buck <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
Subject: Bug#314891: postfix: dns queries use domain search list causing
extraneous dns lookups
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On Sun, Jun 19, 2005 at 12:20:32AM -0700, Edward Buck wrote:
> Not sure if this is a postfix problem or one related to the underlying
> gethostbyname calls.
Postfix uses the resolver options specified in
/var/spool/postfix/etc/resolv.conf - if those say to use a search list,
it will do so.
lamont
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