Re: LUG: New Public DNS from Google - Sun, 06 Dec 2009 22:55:21 -0500

Subject : Re: LUG: New Public DNS from Google

From : Edward Anderson <nilbus@nilbus.[redacted]>

Date : Sun, 06 Dec 2009 22:55:21 -0500

This will help find the lowest latency server, but the difference
between a 20ms DNS response and a 40ms response is really marginal. If
you're arguing ping times, you're missing the boat here.

One the most important features of Google's DNS is that it prefetches
soon-to-expire DNS records, so that the next person to hit that domain
after the TTL expires doesn't have to wait for the DNS sever to
refresh the data from an upstream source. That expiration period
ranges from a few hours to a few days. Point is that when there's a
cache miss, you're going to have to wait a lot longer than the ping
time to get a response. That is what Google DNS is out to eliminate.

Edward

On Sunday, December 6, 2009, Richard Carter <rwcarter@ncsu.[redacted]> wrote:
> Here's a shell script to compare DNS times, you can easily see how to add/replace domains or DNS IPs:
>
> ------------------------------------
>
> #!/bin/sh
> for i in "lifehacker.com" "facebook.com" "manu-j.com" "reddit.com" "tb4.fr" "bbc.co.uk"
> do
>     for j in "4.2.2.2" "8.8.8.8" "8.8.4.4" "208.67.222.222"
>     do
>         echo $j $i `dig @$j $i | grep Query | awk -F ":" '{print $2}'`
>     done
> done
>
> -----------------------------------
>
> By the way, if we're collecting a list of DNS servers on the web, don't forget OpenDNS: 208.67.222.222 and 208.67.220.220.
>
> -Ricket
>
>
>
>
> On Sun, Dec 6, 2009 at 7:38 AM, Shawn Taylor <taylorshawn@hotmail.[redacted] <javascript:_e({}, 'cvml', 'taylorshawn@hotmail.[redacted]');>> wrote:
>
>
>
>
>
>
>
>
> There are a couple of easy to remember DNS servers on hte web that have been around a while.
>
> These are Verizon:
>
> 4.2.2.2
> 4.2.2.3
> 4.2.2.4
> 4.2.2.5
> 4.2.2.6
>
> These are UUnet:
>
> 198.6.1.1
> 198.6.1.2
>
>
> Remember to be kind and put in your ISP's servers once you have your issue(s) resolved.
>
> Shawn
>
> Date: Sun, 6 Dec 2009 06:07:15 -0500
> Subject: New Public DNS from Google
> From: alexjray.ncsu@gmail.[redacted] <javascript:_e({}, 'cvml', 'alexjray.ncsu@gmail.[redacted]');>
> To: lug@lists.ncsu.[redacted] <javascript:_e({}, 'cvml', 'lug@lists.ncsu.[redacted]');>
>
>
>
> Hey all,
> I thought I'd post this here for those interested,
> Google Public DNS:http://code.google.com/speed/public-dns/
>
>
>
> Google's doing a nice public DNS. It's out of the Google Code/Google Open Source division, so maybe it'll be competing with OpenDNS.
> For, the greatest part is the IPs:
>
>
> 8.8.8.8 and 8.8.4.4I can remember those :-)
> Cheers,~Alex
> Windows LiveT Hotmail is faster and more secure than ever. Learn more. <http://www.microsoft.com/windows/windowslive/hotmail_bl1/hotmail_bl1.aspx?ocid=PID23879::T:WLMTAGL:ON:WL:en-ww:WM_IMHM_1:092009>
>
>
>
>

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Re: LUG: New Public DNS from Google