Re: Questions on Squid (dnsserver) and DNS

Dear Steve,

        Great Questions,,

1:- As well as BIND and Squid Dnsserver is concern, Squid has an option
to comple with your bind for optimum performance, see
http://squid.nlanr.net/FAQ and more over if i will be on your place, i would
rather made a cache only DNS for My squid system so i got less time for DNS.

2:- Always Remmeber In resolve.conf Your DNS and every other thing will look
for First IP for DNS query and until its fail it will be used for this. If
its failed then it will try next one, you can increase or decrease the
timeout by recompiling the dns with proper modifications.

3:- By resonfigureing the squid nothing happen mutch but yes a new
session of layer in memory waiting for finishing previous requests and
starting with new config. So i do not think so its related to dns unless u
will restrat your dns,,

With Regards
Ahsan Khan
----- Original Message -----
From: "Steve Snyder" <swsnyder@home.com>
To: "Squid Mailing List" <squid-users@ircache.net>
Sent: Friday, December 03, 1999 2:21 AM
Subject: Questions on Squid (dnsserver) and DNS

> I am running Squid (2.2S5) on a Linux box (RedHat v6.0 / kernel
> v2.2.13) which is also running a nameserver (BIND v8.2.2-P5). Can I
> get some clarification on Squid's dnsserver vs. BIND?
>
> When I cannot resolve a name locally, I (BIND) query one of my ISP's 2
> nameservers. If that fails, I query a root nameserver. In short, my
> nameserver is a pretty standard setup.
>
> By default, Squid reads these entries from my resolv.conf (the last
> 2 addresses are also used as forwarders in my BIND configuration):
>
> nameserver 127.0.0.1
> nameserver 111.222.333.444
> nameserver 555.666.777.888
>
> So here, finally, are my questions.
>
> 1. Is there an advantage to directing Squid (dnsserver) to use only
> address 127.0.0.1 for name resolution, or would I just be creating a
> bottleneck? My thinking is that name resolution would be faster if
> all resolutions went through the local nameserver, rather than having
> dnsserver call one of my ISPs nameservers.
>
> 2. How frequently does dnsserver query the second or third nameservers
> read from resolv.conf? Can I assume that because my local nameserver
> is listed first, that the other server are rarely queried?
>
> 3. I reload Squid's dnsserver ("squid -k reconfigure") on a weekly
> basis in the course of updating my URL redirector. This causes the
> loss of any IP/name data cached by dnsserver. In contrast, my local
> nameserver is rarely restarted, so the info it has cached is retained
> for a longer period. Does this information (relative duration of
> cached data) affect the optimal relationship between dnsserver and
> BIND?
>
> Thank you.
>
>
> *** Steve Snyder ***
>
Received on Thu Dec 02 1999 - 14:54:37 MST