Re: [squid-users] "log_fqdn on" and "logformat" aren't included in the conf. file ?

On 5/06/2014 8:14 a.m., Antony Stone wrote:
> On Wednesday 04 June 2014 at 21:03, Nidal Shater wrote:
>
>> I read about "log_fqdn"
>>
>> Turn this on if you wish to log fully qualified domain names
>> in the access.log. To do this Squid does a DNS lookup of all
>> IP's connecting to it. This can (in some situations) increase
>> latency, which makes your cache seem slower for interactive
>> browsing.
>>
>> Is this very bad to the performance or it has a little effect, because of
>> DNS looks up ?
>
> That's an impossible question to answer with any accuracy, because it depends
> on how efficient the DNS lookups are.

Alongside the latency issue it also makes troubleshooting network
problems much more difficult if the client or server has multiple IPs.
Which is a very common situation to be in given that any machine can
have 1+ IPv4 addresses and 3+ IPv6 addresses.

As a rule of thumb: if you don't actively need it for some reason, leave
the default.

Amos
Received on Thu Jun 05 2014 - 03:44:08 MDT