Hey guys, I have been trying my best to figure this out recently but not having much luck. I am hoping someone here might be able to help.
We had an Etch box that had been running great for almost 2 years. When we decided that we really should upgrade to Lenny, the box had over 300 days of uptime. It was a really solid box that handled a ton of data for us. There are a number of reasons, but we needed to update the system. So I ran the upgrade process. I did an `apt-get update` and `apt-get upgrade` on Etch, restarted, changed out sources to Lenny then did an `apt-get dist-upgrade`. Standard and simple and everything seemed to go really well. However, shortly after, it started slamming our DNS servers. It went from an average of 3.5 requests per minute to over 7000 requests per minute. Every time it talks to a system, it does a DNS lookup. At first I thought it was Apache and or the applications we run, but after some testing, I don't think that is the case. I stopped all the programs and apache before I started pinging other systems by their domain name. It constantly asked the DNS for information. How do I know? I am running `tshark -f 'port 53'` and watching all the data in real time. When I ping a name, it does a lookup. If I leave the ping running, after a few seconds it asks again. I set up a loop using `ping -c1` and no matter how fast the loop ran, it asked for the name every time. So a busy server working with ~50 other computers and tons of connections is asking the DNS for every connection! Can any one help out? I am digging around in all sorts of conf files but not finding anything. My search online seems to suggest I should install a DNS caching utility, but I don't understand why I have this problem. I didn't have it before and on another system running a fresh build of Lenny running the exact same software handling a similar load and its DNS ask rate is just as low as it was on this system running Etch. I am at a loss. I appreciate any help people can give. Thanks, Chris Stackpole -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
