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Posted to users@httpd.apache.org by "Craig A. James" <cj...@emolecules.com> on 2010/12/15 19:10:17 UTC
[users@httpd] DNS Lookups even with HostnameLookups Off
We set "HostnameLookups Off", yet we see many hostnames in both /var/log/apache2/access.log and /var/log/apache2/rewrite log.
This is causing huge problems because some of our clients have IP addresses with no DNS entries, and the delay caused by the lookup is enough to trigger a missed TCP/IP ACK packet on the client, resulting in a five-second delay for every single GET request.
What, besides "HostnameLookups", can cause Apache to do a DNS lookup?
(And yes, I checked HostnameLookups VERY carefully. It is Off in apache2.conf, and doesn't occur anywhere else in the entire disk drive.)
Thanks,
Craig
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Re: [users@httpd] DNS Lookups even with HostnameLookups Off
Posted by "Craig A. James" <cj...@emolecules.com>.
On 12/15/10 10:24 AM, Frank Gingras wrote:
>
>
> On 12/15/2010 01:10 PM, Craig A. James wrote:
>> We set "HostnameLookups Off", yet we see many hostnames in both
>> /var/log/apache2/access.log and /var/log/apache2/rewrite log.
>>
>> This is causing huge problems because some of our clients have IP
>> addresses with no DNS entries, and the delay caused by the lookup is
>> enough to trigger a missed TCP/IP ACK packet on the client, resulting in
>> a five-second delay for every single GET request.
>>
>> What, besides "HostnameLookups", can cause Apache to do a DNS lookup?
>>
>> (And yes, I checked HostnameLookups VERY carefully. It is Off in
>> apache2.conf, and doesn't occur anywhere else in the entire disk drive.)
>>
>> Thanks,
>> Craig
>>
>> ---------------------------------------------------------------------
>> The official User-To-User support forum of the Apache HTTP Server Project.
>> See <URL:http://httpd.apache.org/userslist.html> for more info.
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>
> Craig,
>
> Allow from <hostname> or <VirtualHost <hostname>:<port> > could cause that as well.
Thanks, good point. But we don't do this anywhere. All of our virtual hosts are <VirtualHost *:80> followed by a "ServerName" directive. And all of our "Allow from" are IP addresses.
The odd thing is that only two customers have problems, but both of them are using Windows XP. If we change to "Allow from all", their performance suddenly jumps to normal.
Thanks,
Craig
>
> Frank
>
> ---------------------------------------------------------------------
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>
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Re: [users@httpd] DNS Lookups even with HostnameLookups Off
Posted by Frank Gingras <fr...@gmail.com>.
On 12/15/2010 01:10 PM, Craig A. James wrote:
> We set "HostnameLookups Off", yet we see many hostnames in both
> /var/log/apache2/access.log and /var/log/apache2/rewrite log.
>
> This is causing huge problems because some of our clients have IP
> addresses with no DNS entries, and the delay caused by the lookup is
> enough to trigger a missed TCP/IP ACK packet on the client, resulting in
> a five-second delay for every single GET request.
>
> What, besides "HostnameLookups", can cause Apache to do a DNS lookup?
>
> (And yes, I checked HostnameLookups VERY carefully. It is Off in
> apache2.conf, and doesn't occur anywhere else in the entire disk drive.)
>
> Thanks,
> Craig
>
> ---------------------------------------------------------------------
> The official User-To-User support forum of the Apache HTTP Server Project.
> See <URL:http://httpd.apache.org/userslist.html> for more info.
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> " from the digest: users-digest-unsubscribe@httpd.apache.org
> For additional commands, e-mail: users-help@httpd.apache.org
>
Craig,
Allow from <hostname> or <VirtualHost <hostname>:<port> > could cause
that as well.
Frank
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