Re: [squid-users] External DNS Program

Cool.... thanks for the info!

Peace....

Tom

Henrik Nordstrom <hno@hem.passagen.se>@hem.passagen.se on 04/19/2001
12:04:13 AM

Sent by: hno@hem.passagen.se

To: Tom.Williams@diversifiedsoftware.com
cc: squid-users@squid-cache.org
Subject: Re: [squid-users] External DNS Program

Tom.Williams@diversifiedsoftware.com wrote:
>
> >But you are quite likely to notice the drawbacks of the external DNS
> >helper if you use it. If DNS lookups are slow then the external DNS
> >helper will hit the roof and no further DNS lookups can complete (some
> >Squid versions even abort in such case).
>
> Will multiple external DNS helpers help improve performance of DNS
lookups?

Well, that is why there are multiple of them by default (5 I think). But
I always used the maximum of 32.

The limitation that the external dnsserver helper can only handle one
DNS lookup at a time and cannot be aborted prior to the 2 minutes DNS
lookup timeout. The internal DNS client DOES NOT have this limitation
and can handle any number of concurrent lookups.

--
Henrik Nordstrom
Squid Hacker