>>>> Message: 2 >>>> Date: Mon, 8 May 2006 16:30:44 +0300 (EEST) >>>> Subject: Re: [SM-USERS] Possible DNS problem being shown by >>>> Squirrelmail >>>> From: "Tomas Kuliavas" <[EMAIL PROTECTED]> >>>> To: squirrelmail-users@lists.sourceforge.net >>>> >>>> >>>> >>>>> I've recently installed Squirrelmail on two virtualised (running >>>>> Plesk >>>>> & >>>>> Virtuozzo) supposedly identical web servers running FC3. My problem >>>>> is >>>>> that on one server there was a delay of 5-10 seconds in displaying >>>>> any >>>>> pane in Squirrelmail. This same server was initially unable to >>>>> resolve >>>>> any external addresses and was fixed by Tech Support adding another >>>>> name >>>>> server to /etc/resolv.conf . Then it was slow to resolve external >>>>> addresses (the same 5-10 seconds) upon doing something like "wget >>>>> http://www.google.com";, I fixed this myself by changing the DNS >>>>> servers >>>>> in /etc/resolve.cfg to be the same ones as on the trouble-free >>>>> server. >>>>> However Squirrelmail was still exhibiting the 5-10 second delay when >>>>> opening panes. By changing the IMAP server that SM uses from >>>>> "mail.babbnet.com" to "localhost" I was able to remove this delay. >>>>> However I'm conscious the underlying problem is still there and I >>>>> would >>>>> like to work out what is going on. I would like to be able to do >>>>> something on the command line to illustrate the problem to Tech >>>>> Support >>>>> (I can't just tell them SM is slow as SM is installed by myself and >>>>> as >>>>> such isn't supported by them) and would ideally like to be able to >>>>> fix >>>>> it myself without waiting for them! >>>>> >>>>> Can anyone see why "mail.babbnet.com" vs. "localhost" would cause >>>>> this >>>>> delay? >>>>> >>>>> >>>> a) localhost is resolved in /etc/hosts, mail.babbnet.com is resolved >>>> in >>>> dns. >>>> >>>> b) connection to mail.babbnet.com goes through different interface and >>>> some traffic (maybe tcp/113) is dropped by firewall rules. >>>> >>>> if you are unprivileged user on server and can change globally used >>>> dns >>>> server's without any help from tech support - change your provider. >>>> /etc/resolv.conf is not supposed to be world writable. >>>> >>>> >>>> >>> Hi, >>> I have root access to these servers so there's no problem there! I'm >>> just trying to work out what I can do to illustrate this problem to >>> tech >>> support, it's no use telling them how the problem manifests itself in >>> Squirrel Mail as they don't support this seeing as I've installed it >>> myself. >>> >>> How could I replicate the slow resolution of mail.babbnet.com on the >>> command line? >>> >> >> ---- >> <?php >> function microtime_float() { >> list($usec, $sec) = explode(" ", microtime()); >> return ((float)$usec + (float)$sec); >> } >> >> $start = microtime_float(); >> >> $stream = fsockopen('localhost', 143,$errorNumber, $errorString); >> if(!$stream) { >> die('connection failed'); >> } >> $imapline = fgets($stream, 1024); >> fputs($stream, "A001 LOGOUT\r\n"); >> fclose($stream); >> >> $end = microtime_float(); >> >> echo $end - $start; >> ?> >> ---- >> >> replace 'localhost' with 'mail.babbnet.com' or ip address and time code >> execution ('time php test.php'). 143 is port number. If you use TLS, >> prefix host name with 'tls://' and change port number. >> >> > Thanks for that, it gives localhost: 0.0099411010742188 and > mail.babbnet.com: 5.2097821235657 > Hopefully this simplified illustration of the problem should be good > enough for Tech Support to fix the problem.
check ip address connection times (212.241.195.198 and 127.0.0.1) and see what happens when you add mail.babbnet.com to /etc/hosts. Make sure that mail.babbnet.com is resolved to local address and not to some remote server. -- Tomas ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 -- squirrelmail-users mailing list Posting Guidelines: http://www.squirrelmail.org/wiki/MailingListPostingGuidelines List Address: squirrelmail-users@lists.sourceforge.net List Archives: http://news.gmane.org/thread.php?group=gmane.mail.squirrelmail.user List Archives: http://sourceforge.net/mailarchive/forum.php?forum_id=2995 List Info: https://lists.sourceforge.net/lists/listinfo/squirrelmail-users
