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From Farid Hamjavar <hamja...@unm.edu>
Subject Re: [users@httpd] logresolve is not doing it job
Date Thu, 21 Aug 2003 15:13:28 GMT

Thank you Jeremy and Robert ...

Do you know if I can turn this "double reverse DNS lookup"
off ... well ... without re-compile?

Also I was wondering (beacuse I don't know as we don't use 2.0 yet)
does logresolve that comes with   apache 2.0 also behaves this
way?

Thanks,
Farid
UNM



On Thu, 21 Aug 2003, Robert Andersson wrote:

> Date: Thu, 21 Aug 2003 06:26:58 +0200
> From: Robert Andersson <robert@profundis.nu>
> Reply-To: users@httpd.apache.org, Robert Andersson <robert@profundis.nu>
> To: users@httpd.apache.org
> Subject: Re: [users@httpd] logresolve is not doing it job
> 
> Farid Hamjavar wrote
> > Bad host: dial14-pm31-nv.tls.net != 65.196.227.145
> >
> > that's bogus because that IP# 65.196.227.145 is dns resolvable.
> > How come logresolve is unable to resolve it?
> 
> Because it does a 'double reverse DNS lookup', that is, it first do a
> reverse lookup on the IP to get a hostname and then lookup that hostname to
> compare the original IP with. If they don't match, it is deemed 'bogus'.
> 
> In this case it is obvious that the visitor was a dial-up user, or other
> DHCP client, for which a hostname is more or less randomly generated when
> the client is assigned an IP. When you process your logs, the user is long
> gone and/or has a new IP and hostname, and the previous are given to others
> and don't match anymore.
> 
> Regards,
> Robert Andersson
> 
> 
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