<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 14 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p
{mso-style-priority:99;
mso-margin-top-alt:auto;
margin-right:0cm;
mso-margin-bottom-alt:auto;
margin-left:0cm;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{mso-style-priority:99;
mso-style-link:"Sprechblasentext Zchn";
margin:0cm;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif";}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
{mso-style-priority:34;
margin-top:0cm;
margin-right:0cm;
margin-bottom:0cm;
margin-left:36.0pt;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
span.SprechblasentextZchn
{mso-style-name:"Sprechblasentext Zchn";
mso-style-priority:99;
mso-style-link:Sprechblasentext;
font-family:"Tahoma","sans-serif";}
span.E-MailFormatvorlage21
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.E-MailFormatvorlage22
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 2.0cm 70.85pt;}
div.WordSection1
{page:WordSection1;}
/* List Definitions */
@list l0
{mso-list-id:2090153457;
mso-list-type:hybrid;
mso-list-template-ids:-1701531692 796279590 67567619 67567621 67567617 67567619 67567621 67567617 67567619 67567621;}
@list l0:level1
{mso-level-start-at:0;
mso-level-number-format:bullet;
mso-level-text:-;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:"Times New Roman","serif";
mso-fareast-font-family:Calibri;}
@list l0:level2
{mso-level-number-format:bullet;
mso-level-text:o;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:"Courier New";}
@list l0:level3
{mso-level-number-format:bullet;
mso-level-text:;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Wingdings;}
@list l0:level4
{mso-level-number-format:bullet;
mso-level-text:;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Symbol;}
@list l0:level5
{mso-level-number-format:bullet;
mso-level-text:o;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:"Courier New";}
@list l0:level6
{mso-level-number-format:bullet;
mso-level-text:;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Wingdings;}
@list l0:level7
{mso-level-number-format:bullet;
mso-level-text:;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Symbol;}
@list l0:level8
{mso-level-number-format:bullet;
mso-level-text:o;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:"Courier New";}
@list l0:level9
{mso-level-number-format:bullet;
mso-level-text:;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Wingdings;}
ol
{margin-bottom:0cm;}
ul
{margin-bottom:0cm;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="DE" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I hope I’ve found a workaround now… Unfortunately I made a mistake while disabling ipv6 on my debian host. I tried to disable it with “net.ipv6.conf.all.disable_ipv6=1”
but this didn’t work out so. Setting “net.ipv6.conf.bond0.disable_ipv6 = 1 “ did the job and my syslog-ng faulty name rate was down to almost none. I hope the problem is gone now but I will monitor this more closely for 2 more weeks.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">It seems like syslog-ng doesn’t like ipv6 and I hope this will be fixed in the future.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Von:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> syslog-ng-bounces@lists.balabit.hu [mailto:syslog-ng-bounces@lists.balabit.hu]
<b>Im Auftrag von </b>Daniel Neubacher<br>
<b>Gesendet:</b> Donnerstag, 22. November 2012 11:35<br>
<b>An:</b> Balazs Scheidler; Syslog-ng users' and developers' mailing list<br>
<b>Betreff:</b> Re: [syslog-ng] syslog uses wrong and weird hostnames<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Sorry but I was given other tasks the last weeks but now I’m on this problem again… I still can’t figure it out :(<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">> keep-hostname() is false in your case, which means it resolves hostnames from dns and /etc/hosts
<br>
Yes we need this because we don’t have only syslog-ng clients in our network. Our PDU’s for example are logging only their hostname which is for four of them only a-1 and not the fully qualified name which we need.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><br>
>Isn't it possible that you get ipv6 traffic from special addresses, and those are resolved onto the names it uses?
<br>
No. I’ve disabled ipv6 completely on the server. The DNS server doesn’t serve any AAAA records either.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><br>
>can you run tcpdump on the server to confirm? do you have ipv6 source configured?</span><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">In the dump I’m seeing dns lookups for AAAA records which I can’t explain. But this isn’t happing for every host and only sometimes.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">What I’ve done to debug this problem:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt">Compiling syslog-ng 3.3.4,5,6 & 7
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt">Installing different linux distributions: Debian Squeeze, CentOs 6.2 and Ubuntu 12.10 and using the binary packets<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt">Switching off ipv6 on the server<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt">Configuring ip6tables to block all incoming v6 traffic<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt">“options single-request” in resolv.conf<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt">Deleting the ipv6 default settings in the hosts file. This only cause that ip6-localnet & co are not used as names anymore<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt">Switching of syslog-ng dns cache<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt">Using nscd as cache (but this solution created even more weird names)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt">Using a local bind with a copy of our zones<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt">Out of ideas now<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">I can’t understand why I’m the only one who is experience this problem if I can reproduce it on any linux distribution and with any of the last syslog versions…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Von:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Balazs Scheidler [</span><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""><a href="mailto:bazsi77@gmail.com"><span lang="EN-US">mailto:bazsi77@gmail.com</span></a></span><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">]
<br>
<b>Gesendet:</b> Dienstag, 25. September 2012 07:19<br>
<b>An:</b> Syslog-ng users' and developers' mailing list; Daniel Neubacher<br>
<b>Betreff:</b> Re: [syslog-ng] syslog uses wrong and weird hostnames<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p><span lang="EN-US">----- Original message ----- <br>
> Hello there, <br>
> My syslog-ng is logging fine from 700 servers but a few times per day it <br>
> is logging into a wrong folder which is created by the $HOST variable. <br>
> Normally syslog should use a hostname like host-1.worker.foobar.com but <br>
> a few times a day it creates a folder names like: <br>
> <br>
> 4.22 <br>
> p6-allrouter? <br>
> p6-localnet <br>
> p6-mc? <br>
> p6-mcastpref <br>
> p6-mcastpref? <br>
> host-1.worker.foobar.xcom <br>
> and other weird names... <br>
> <br>
> It only logs one or two lines and then uses the right folder again. Does <br>
> anyone have a clue where I have to look for the problem? <br>
> <br>
> Here are the option line from the server and the client: <br>
> <br>
> Client: <br>
> @version: 3.3 <br>
> options { <br>
> threaded(yes); <br>
> <br>
> use_dns(yes); <br>
> use_fqdn(yes); <br>
> dns_cache(yes); <br>
> dns_cache_size(16384); <br>
> dns_cache_expire(3600); <br>
> dns_cache_expire_failed(10); <br>
> <br>
> log_msg_size(256000); <br>
> log_fifo_size(100000); <br>
> <br>
> normalize_hostnames(yes); <br>
> check_hostname(yes); <br>
> bad_hostname("^gconfd$"); <br>
> <br>
> create_dirs(yes); <br>
> owner("root"); <br>
> group("root"); <br>
> perm(0640); <br>
> <br>
> time_reopen(30); <br>
> }; <br>
> <br>
> Server: <br>
> <br>
> options { <br>
> threaded(yes); <br>
> owner("root"); <br>
> group("root"); <br>
> perm(0660); <br>
> <br>
> dir_owner("root"); <br>
> dir_group("root"); <br>
> dir_perm(0770); <br>
> create_dirs(yes); <br>
> <br>
> chain_hostnames(no); <br>
> normalize_hostnames(yes); <br>
> check_hostname(yes); <br>
> keep_hostname(no); <br>
> <br>
> use_fqdn(yes); <br>
> dns_cache(yes); <br>
> dns_cache_size(16384); <br>
> dns_cache_expire(3600); <br>
> dns_cache_expire_failed(60); <br>
> <br>
> log_msg_size(256000); <br>
> log_fifo_size(1000000); <br>
> }; <br>
> <br>
> Destination example: <br>
> destination d_syslog { <br>
> file("/log/syslog/${R_YEAR}/${R_MONTH}/${R_DAY}/$HOST/$PROGRAM"); }; <br>
<br>
keep-hostname() is false in your case, which means it resolves hostnames from dns and /etc/hosts
<br>
<br>
Isn't it possible that you get ipv6 traffic from special addresses, and those are resolved onto the names it uses?
<br>
<br>
can you run tcpdump on the server to confirm? do you have ipv6 source configured?<o:p></o:p></span></p>
</div>
</body>
</html>