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08-01-2009, 06:48 AM #1Junior Guru Wannabe
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High Ping + Packet Loss at Dedicated Server
I am facing high ping and packet loss issues with a server hosted at hetzner.de (CentOS + WHM)
For some unknown reason pings go high and stay like this (average 1500ms) until I reboot the server.
Here is a screenshot of tracert from server to me: http://www.imagebam.com/image/37409243863747
Any tips and opinions are more than welcome.
Thank you in advance!
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08-01-2009, 07:26 AM #2Junior Guru Wannabe
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Just by looking at your traceroute the latency to your first hop is extraordinarily high.
What are your loads on this server? How fast is your physical port speed?
A little minor troubleshooting should point you in the right direction. Try checking your mrtg/rtg graph, or running top and iostat. Do you see a high percent of IOWAIT?
When in doubt open up a trouble ticket with your provider and have them investigate the issue.AS46176∙Savvis∙Abovenet∙nLayer∙Mzima∙Onering∙Level3∙Cogent∙Telia Fully Route Optimized
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08-01-2009, 07:34 AM #3Web Hosting Master
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Those high values solved by a reboot; would make me advise you to contact your server management company and let them look into it; either the server is to busy (to small for to many requests) or you may have some kind of attack to your server. Really there are to many reasons why this can happen.
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08-01-2009, 07:42 AM #4Web Hosting Master
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also, speak to your provider and ask them if any of the other servers in the same cab are bursting to port speed. (common cause of packet loss). sounds like to me they have over sold there network either that or a dogy switch some where.
however considering you said its your server that gets sorted by a reboot. im more inclined to say its a dogy script or somthing on ur box giving you issues..done any scans for virues, trojans etc?
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08-01-2009, 07:51 AM #5Junior Guru Wannabe
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Correct, that's why I believe it's a server-side issue.
What are your loads on this server? How fast is your physical port speed?
A little minor troubleshooting should point you in the right direction. Try checking your mrtg/rtg graph, or running top and iostat. Do you see a high percent of IOWAIT?
top: http://www.imagebam.com/image/fa69e443868602
iostat: http://www.imagebam.com/image/bb70cd43868656
When in doubt open up a trouble ticket with your provider and have them investigate the issue.
Any suggestions on what to do next?
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08-01-2009, 08:14 AM #6Web Hosting Master
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Did you check your connections to your server ?
i.e.
netstat -an |grep tcp|awk '{print $5}'|cut -d: -f1|sort|uniq -c|sort -n
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08-01-2009, 08:23 AM #7Junior Guru Wannabe
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Does it look "ok" to you?
udp: http://www.imagebam.com/image/50051043871198
tcp: http://www.imagebam.com/image/cd545a43871266
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08-01-2009, 08:35 AM #8Web Hosting Master
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Seems to be okay as well; one other thing you may have a problem with is the firewall; if you installed any; did you try what happens when disabling it; or completely flushing all added rules ?
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08-01-2009, 08:36 AM #9Junior Guru Wannabe
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I haven't installed any additional firewall. Server was built a week ago, and working fine till yesterday.
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08-01-2009, 08:39 AM #10Web Hosting Master
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I would install a firewall asap to block any unwanted traffic. I would suggest to look at CSF; http://www.configserver.com/cp/csf.html
and let someone look at your server with server management skills to find out where this comes from.» cPanel Servers in Europe: Strasbourg (FR), Haarlem & Amsterdam (NL) & Kent (UK), USA (Los Angeles, St.Louis), Asia (Singapore) | Follow us at Twitter: @040hosting
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08-01-2009, 08:57 AM #11Junior Guru Wannabe
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Do you recommend any management service I should contact?
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08-01-2009, 09:12 AM #12Web Hosting Master
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There are plenty of companies; try to look at the WHT wiki for managed companies; and you will see a whole list of companies you can contact.
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08-01-2009, 07:04 PM #13Junior Guru Wannabe
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The load seems fine, same with the iostat output. Is the server still showing high latency? Do these captures again when the server is slow. Your provider should have a traffic graph, if not try making a request. Are you bursting higher than the rate limit or physical port speed? There are any number of reasons for high latency, keep digging.
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08-01-2009, 07:40 PM #14Engineer
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Provide the output of lspci, I believe hetzner use realtek nics which have an issue with the r8169 driver provided by centOS. Using the old version r8168 will correct it.
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08-02-2009, 04:56 AM #15Junior Guru Wannabe
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Your provider should have a traffic graph, if not try making a request.
Here is output of lscpi: http://www.imagebam.com/image/6b652e43965908
Does this make sense Scott?
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08-02-2009, 07:27 AM #16Engineer
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08-02-2009, 07:46 AM #17Junior Guru Wannabe
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AS46176∙Savvis∙Abovenet∙nLayer∙Mzima∙Onering∙Level3∙Cogent∙Telia Fully Route Optimized
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08-02-2009, 08:06 AM #18Engineer
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I found a link for you,
http://wiki.hetzner.de/index.php/Ins...der_CentOS_5.3Server Management - AdminGeekZ.com
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08-02-2009, 12:13 PM #19Junior Guru Wannabe
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I will try to install driver and get back to you.
Just a question Scott, do I need to follow "Using kmod-r8168 from elrepo.org on CentOS" step only or "Installation from source" as well?
Thank you Scott and SoutheastWeb.
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08-02-2009, 05:15 PM #20Engineer
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You can use either, no need to both. The kmod-r8168 will most likely be a prebuilt module for your CE kernel so you will only need to install this, this is likely the easier option for you.
The other option is to install from source which base in mind you will need the kernel rpm to provide the sources in /usr/src before you can compile against it.Server Management - AdminGeekZ.com
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