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<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 lfo1"><![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 lfo1"><![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 lfo1"><![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 lfo1"><![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 lfo1"><![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 lfo1"><![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 lfo1"><![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 lfo1"><![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 lfo1"><![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 lfo1"><![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>
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<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>
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<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>
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