Re: [Netdisco] Reverse DNS Lookups

[Max B. <ma...@wa...>]

When this issue has come up in the past, most people end up putting a 
caching name server on the same box or subnet as netdisco and tweaking 
the parameters there with long caching times and fast timeouts.

-m


On 11/08/2010 07:47 AM, Ingen Schenau, Jeroen van (ICTS) wrote:
> On Mon, 2010-11-08 at 15:22 +0000, Robert Kerr wrote:
>    
>> On Fri, 2010-11-05 at 19:52 +0000, Joel Krauska wrote:
>>      
>>> Why not incorporate this in to the database?
>>>        
>>      
>>> I have a lot of IPs which don't return reverse DNS, so when I load the
>>> device.html file with reverse dns lookups on, it can take up to 2
>>> minutes to load.
>>>        
>>      
>>> I've disabled the lookup, but why not just run this after each arp
>>> lookup and store the reverse dns for a time?
>>>        
>>      
>>> (doing it on every page load seems wasteful)
>>>        
>> I'd say doing it every page load is far less wasteful that doing it
>> every arpnip. Your mileage of course may vary - it depends how many IPs
>> you have in netdisco, how often you run arpnip, how often you access the
>> netdisco web UI, and how many ports you have per device. In my case
>> doing it every arpnip would result in 30k lookups an hour.
>>      
> Perhaps we could cache the DNS results that we do on page display, for a
> certain amount of time? That way at least a page refresh doesn't result
> in a lot of new DNS requests...
>
> We'd also have to cache negative results though...
>
>
> Regards,
>
> Jeroen van Ingen
> ICT Service Centre
> University of Twente, P.O.Box 217, 7500 AE Enschede, The Netherlands
>
>
>
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