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From "Boyle Owen" <Owen.Bo...@swx.com>
Subject RE: [users@httpd] Retry: HostnameLookups timeout?
Date Wed, 22 Mar 2006 15:58:21 GMT
> -----Original Message-----
> From: Markus Mayer [mailto:mymaillists@gmx.at] 
> Sent: Mittwoch, 22. März 2006 16:15
> To: users@httpd.apache.org
> Subject: [users@httpd] Retry: HostnameLookups timeout?
> 
> 
> Generally reverse lookups work well, but for some IP 
> addresses the reverse 
> lookup times out.  
> 
> To get around this problem, I wanted to configure how long 
> apache waits for a 
> response, however I have not been able to find such an 
> option.  

I suspect that this is not apache's problem... In the OSI model, Apache works on the application
layer so any requests for services from other machines are passed down to the TCP/IP layer
for routing. It is there that the DNS lookup takes place.

>From apache's POV, all it does is ask the TCP/IP layer to get the hostname for a particular
IP - apache doesn't care about the implementation...

> I also looked 
> in the source code, but was not able to find where this 
> timeout is set.  

look in server/core.c; apache uses apr_getnameinfo() which in turn uses the system function
getnameinfo() (do "man getaddrinfo" for details)

Rgds,
Owen Boyle
Disclaimer: Any disclaimer attached to this message may be ignored. 

> Either solution is fine for me, however of course a 
> configuration directive 
> to set timeouts for HostnameLookups would be much more 
> preferable.  Does any 
> one know what directive there is to set, of if there is even 
> one?  And if 
> there's no directive, where in the source code do I look to set this?
> 
> All help on this will be greatly appreciated.
> 
> greetings from Austria.
> Markus
> 
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