[FC3] Sites 'disappearing' from DNS

[Nigel Wade]

Brian Fahrlander wrote:
> On Mon, 2005-04-04 at 23:36 +0200, Jean Francois Martinez wrote:
> 
>>What could be happenning is that your ISP is rotating his machines on
>>DNS and sending your notifications through DHCP.  But you have a static
>>configuration for named so it is pointing at machines who for some
>>reason don't have up to date data.  You have to read the DHCP
>>documentation in order for it updating your named config, and, very 
>>important, firewall config and then restarting both.
> 
> 
>     No, I'm on a static IP, and the problem was two different
> applications not sharing the same information- "host" could find it in a
> flash, but Firefox wouldn't...even immediately after it.
> 
>     Thankfully, "ncsd -i host" on the command line nailed it.
> 
>     Thanks, though!
> 

Given that nscd is the "problem", you can alter the time for which nscd 
caches failed DNS lookups. In /etc/nscd.conf change the timeout value in

negative-time-to-live hosts 300

to a smaller value than 300 seconds.

-- 
Nigel Wade, System Administrator, Space Plasma Physics Group,
             University of Leicester, Leicester, LE1 7RH, UK
E-mail :    nmw at ion.le.ac.uk
Phone :     +44 (0)116 2523548, Fax : +44 (0)116 2523555