woody unusable for dial on demand because of exim/libc6 bug
Hi there,
I have noticed a bad behavior of exim or something exim calls several
month ago and it still seems to exist:
exim does a DNS lookup of localhost each time it is called instead of
using /etc/hosts.
On dial on demand systems this is really harmfull as a connection is
established with each exim queue run (normally every 15 minutes) and
stays on until an idle timeout only to be restablished again a few
minutes later.
This could be really expensive for people who have to pay per minute!
There was a discussion about this with Philip Hazel (exim developer) at
that time:
http://www.exim.org/pipermail/exim-users/Week-of-Mon-20011105/031907.html
The DNS lookup seems to be invoked by a gethostbyname() call.
As I was not interested in DoD at that time I dropped the issue without
solving it and hoped it will disappear without special attention.
There is already a bug report about it as well. However, it does not say
anything about DoD:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=96633&repeatmerged=yes
As hinted by Kevin Tappe this could be caused by a (resolved?) libc6 bug:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=118364&repeatmerged=yes
Maybe the libc6 issue is resolved for DNS A entries, but not for DNS MX
entries?
Barry Mathieu has asked recently for help with this issue on debian-user
and I guess the more people switch over to woody the more people will
complain ...
I do not know if I am mailing to the right list/people to get the
required attention, but if not please forward this mail to the right
place.
Thanks in advance for your help.
Bye, Steffen
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