Public bug reported: Binary package hint: avahi-daemon
I encountered this problem on a machine that is integrated into our work network. I performed a dist-upgrade to Feisty on my desktop and all went well. I've noticed recently that any dns based work seemed to take a significantly longer time then normal. My system is getting dns information on our company internal systems from two dns servers. Previously, if I tried to establish an ssh connection with another system I could generally expect the connection in under 3 secs. After the dist-upgrade the time went from under 3 seconds to approximately 25 seconds. After searching around the system I found an entry in /etc/nsswitch.conf that cause me a little concern. The line in question is: hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4 I looked around a bit and it seems that the references to mdns are really talking about communication with the Avahi mDNS/DNS-SD daemon. Since this looks to be a part of a zeroconf configuration I wasn't expecting too much in my current environment, as we really only have three Mac's. What concerned me is the idea that if we hit files with no answer there is a delay while we hit the other options until we hit dns, which is where the information I seek existed. For an experiment I tried two separate tests. The first changed the line to looks like: hosts: files dns mdns4_minimal [NOTFOUND=return] mdns The change should have improved the time, but I was still looking at approximately 23 seconds to return a command prompt on the destination machine. Finally, I change the entry to simply: hosts: files dns After this change I was again receiving the destination command prompt in under 3 seconds. I don't know if simply changing the file will correct the problem long-term or not. Seems to help me, but might be the way to go for most Ubuntu users. ProblemType: Bug Architecture: i386 Date: Thu Mar 22 18:10:54 2007 DistroRelease: Ubuntu 7.04 Uname: Linux samdesk 2.6.20-12-generic #2 SMP Wed Mar 21 20:55:46 UTC 2007 i686 GNU/Linux ** Affects: avahi (Ubuntu) Importance: Undecided Status: Unconfirmed -- mdns listed in nsswitch.conf causes excessive time for dns lookups https://launchpad.net/bugs/94940 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs