Rajko M. wrote:
On Wednesday 20 May 2009 04:13:18 am Per Jessen wrote:
Rajko M. wrote:
openSUSE 11.1
Using Wireshark to see the bug in Knode I noticed that nscd is asking DNS server for couple of addresses every 15 sec.
That added with AAAA (IPv6) queries makes DNS server quite busy.
"quite busy" for a few queries every 15sec? Your DNS server would have to be running on a 386sx25 for that to make it even remotely busy :-)
I missed to mention that prospect of having thousands of boxes that are asking for past DNS queries every 15 seconds in IPv6 and 4 adds load to my provider's DNS server.
No doubt, but that is what providers do.
There must be the way to set longer interval and quit IPv6 that my DNS server have no clue about.
Find out what it is - AFAIK, nscd is only caching, it doesn't have a life of its own.
I guess it is checking validity of cached data.
Nope, I'm quite certain that is done by a TTL. nscd is a pretty simple daemon - if it doesn't have a fresh response to a query, it'll just say no and glibc will continue with the next option.
Stopping it stops spurious queries.
Ah. I've just had a tcpdump running for 2 minutes and didn't see a single DNS query. Can't reproduce. If you run a tcpdump, it'll tell you what is being queried - maybe that'll give us a clue. /Per -- Per Jessen, Zürich (29.3°C) -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org