Hi,
I had this issue in Ubuntu 15.10 fresh install. I know my PTR is oke.
host: cc04
localdomein: bla.example
ping cc04 works, gives me the IP and the reverse lookup
ping cc04.bla.example does not work.
after removing mdns4_minimal [NOTFOUND=return] from /etc/nsswitch
everything is working again.
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https://bugs.launchpad.net/bugs/94940
Title:
mdns listed in nsswitch.conf causes excessive time for dns lookups
Status in avahi package in Ubuntu:
Confirmed
Status in nss-mdns package in Ubuntu:
Confirmed
Status in nss-mdns package in Debian:
Fix Released
Bug description:
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
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